Error Code 45: Device Not Connected to Computer – How to Restore Wi-Fi in 10 Minutes

You opened the Device Manager to check why your Wi-Fi isn't working and saw a scary message: "This device is not currently connected to your computer (code 45)"The network adapter seems to have disappeared, and Windows stubbornly refuses to "see" it. As a result, there's no internet or connection to the router. This error most often occurs after a system update, a driver failure, or a physical disconnection of the Wi-Fi module (for example, on a laptop). The good news: in 90% of cases, the problem can be resolved without visiting a service center.

In this article we will look at all possible reasons mistakes code 45 — from a simple adapter disablement in BIOS to driver conflicts. You'll learn how Force the Wi-Fi module to turn on via the Windows registry, if standard methods don't work, and what to do if the adapter isn't showing up in the system at all. For laptop owners, we've added a separate section on checking hardware switches—these are often overlooked even by experienced users.

Before proceeding with the instructions, make sure the problem is with the adapter and not the router. Try connecting to Wi-Fi from another device (smartphone, tablet). If the internet works, continue reading. If not, the problem is with your ISP or router, and you can close this article.

What does error code 45 mean and why does it appear?

Code 45 in the Windows Device Manager it signals that The operating system cannot detect the connected hardware.This isn't a driver error (like code 10 or 28), but a hardware or software issue with the device. The most common issues are:

• 📶 Wi-Fi adapters (built-in and USB)
• 🖥️ Video cards (especially discrete ones on laptops)
• 🔊 Sound cards
• 📡 Bluetooth modules

The reasons for the error are divided into software And hardware:

The error is especially common code 45 occurs after:

• 🔄 Major Windows updates (for example, upgrading from Windows 10 to 11)
• ⚡ Power surges or sudden power outage
• 🛠️ Cleaning your laptop from dust (they could have damaged the Wi-Fi module cable)
• 🔧 Installing pirated Windows builds (native drivers are missing)

⚠️ Attention: If the error appeared after disassembling the laptop or replacing components (for example, RAM), there is a high probability that The Wi-Fi module cable is not connected to the motherboard.In this case, re-disassembly will be required.

First steps: Checking the adapter's physical connection

Before you dig into Windows settings, make sure the problem isn't in hardwareThis is especially true for laptops and all-in-one PCs, where the Wi-Fi module can be disabled mechanically.

Let's start with the most obvious:

• 🔄 Restart your computer. Sometimes there is a mistake code 45 This occurs due to a temporary OS glitch. A simple reboot may restore the adapter to working order.
• 🔌 Check the USB port (If you're using an external Wi-Fi adapter). Try connecting it to a different port or another device (e.g., a flash drive)—if the port isn't working, the adapter won't be detected.
• 📱 Make sure Wi-Fi is not disabled at the router level. Log into your router's web interface (usually at 192.168.0.1 or 192.168.1.1) and check if the wireless network is turned on.

For laptops And monoblocks Please perform additional checks:

1. Locate the Wi-Fi hardware switch. On some models (eg, Lenovo ThinkPad, Dell Latitude) There's a physical button or slider on the case that disables the wireless modules. It's often located on the front panel or side.
2. Check your keyboard shortcuts. On most laptops, Wi-Fi is turned on/off with a combination Fn + F2 (or another function key with an antenna icon). Press it several times—sometimes it works with a delay.
3. Look at the Wi-Fi indicator. If there is an LED with an image of an antenna on the laptop case and it is not lit, the module is disabled by hardware.

Restarted the computer | Checked the USB port (for external adapters) | Found the hardware Wi-Fi switch | Checked the Fn+F(1-12) key combination | Made sure the Wi-Fi indicator was off-->

If after all manipulations the adapter is still not detected, proceed to software methods for troubleshooting the error code 45.

Enabling the Wi-Fi adapter through Device Manager

Even if the adapter is marked as a "disabled device," you can try enabling it manually. To do this:

1. Open device Manager:
   • Click Win + X and select the appropriate item.
   • Or type in Windows search devmgmt.msc and press Enter.

Expand the section Network Adapters.

Find your Wi-Fi module. It may have different names:

• Intel(R) Wireless-AC 9560
• Qualcomm Atheros QCA61x4A
• Realtek RTL8821CE
• Broadcom 802.11ac
• If the adapter is gray, right-click on it and select "Engage".
• If the adapter is not in the list, open the menu "View" and check the box Show hidden devices.

If the adapter does not turn on or immediately disappears again, try update hardware configuration:

1. In the Device Manager, click on the computer name (first line at the top).
2. Select Action → Update hardware configuration.
3. Wait for the process to complete (may take up to 1 minute).

If the adapter still doesn't appear, proceed to the next section - it may be disabled at the BIOS level.

Checking BIOS/UEFI settings: enabling the Wi-Fi module

In some cases, the Wi-Fi adapter is disabled in the BIOS/UEFI settings. This may occur after:

• 🔧 Reset BIOS settings to factory defaults.
• 🔄 Motherboard firmware updates.
• 🛠️ Replacing the CMOS battery (on desktop PCs).

To check and enable the adapter in BIOS:

1. Restart your computer and enter the BIOS. To do this, press:
   • Lenovo, Dell, HP — F2 or F12
   • Asus, MSI, Gigabyte — Del or F2
   • Acer, Samsung — F2 or Esc

Find the section related to wireless devicesIt can be called by different names:

• Advanced → Onboard Devices Configuration
• Configuration → Wireless LAN
• System Configuration → Network Stack
• Make sure the parameters Wireless LAN, Wi-Fi or WLAN set in position Enabled.
• Save the settings (usually the key F10) and reboot.

If your BIOS doesn't explicitly mention Wi-Fi, look for settings related to:

• 🔌 PCIe/PCI Subsystem Settings (The Wi-Fi module is often connected via PCIe)
• 🔄 Onboard LAN Controller (sometimes controls all network devices)
• ⚡ Power Management (may block wireless modules)

⚠️ Attention: On some laptops (eg. HP EliteBook or Dell Latitude) there is a separate option in the BIOS WWAN (for mobile internet). Disabling it may also disable Wi-Fi. If you're unsure, don't change the settings; take a photo of the current settings before making any changes.

If the adapter is still not detected after being enabled in BIOS, the problem may be in the drivers or the Windows registry.

Fixing Error Code 45 via the Windows Registry

If the adapter is physically in good working order, but Windows stubbornly “does not see” it, the problem may lie in incorrect registry entriesThis method will help if:

• The adapter appears and disappears in the task manager.
• Error code 45 occurs after a Windows update.
• The drivers are installed, but the device is marked as disabled.

To edit the registry:

1. Click Win + R, enter regedit and press Enter.
2. Follow the path:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e972-e325-11ce-bfc1-08002be10318}

   This section contains settings all network adapters.

3. In the right part of the window, find the parameter UpperFilters And LowerFiltersIf they exist - delete them (right click → "Delete").
4. Close the registry editor and restart your computer.

After rebooting, Windows will rebuild the network device configuration, and the adapter should appear in the Device Manager. If this doesn't happen, try the following:

1. Open Registry Editor again.
2. Follow the path:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces

3. Expand all subfolders (they are named with a random set of characters) and check the parameter in each one DhcpIPAddressIf it exists - delete it.
4. Restart your PC.

⚠️ Attention: Incorrectly editing the registry may result in Windows malfunctionBefore the changes create a restore point (Control Panel → Recovery → Configure System Restore). If the system does not boot after editing the registry, boot into safe mode (F8 on boot) and roll back the changes.

Updating and reinstalling Wi-Fi adapter drivers

Error code 45 often occurs due to driver conflict or damage. Even if the adapter is disabled, the correct driver can "wake it up." Follow these steps:

Step 1: Uninstall the current driver

1. Open device Manager (devmgmt.msc).
2. Expand Network Adapters.
3. Find your Wi-Fi module, right-click and select "Remove device".
4. Check the box "Delete the driver software for this device" (if any) and confirm.

Step 2. Installing the driver

There are three ways to install the driver:

• 🔄 Automatically via Windows Update:
  1. In the device manager, click Action → Update hardware configuration.
  2. Windows should find and install the driver itself.
• 💾 Manually from the manufacturer's website:
  1. Download the driver for your adapter model from the official website:
     • Intel: downloadcenter.intel.com
     • Realtek: www.realtek.com
     • Qualcomm Atheros: www.qualcomm.com
     • Broadcom: www.broadcom.com
• Install the driver and restart your PC.
• 🔧 Via hardware ID (if the adapter is unknown):
  1. In the Device Manager, right-click on the unknown device (if there is one) and select "Properties".
  2. Go to the tab "Intelligence" and select Equipment ID.
  3. Copy the first line (eg. PCI\VEN_8086&DEV_24FD) and find the driver using this code through DevID.info or DriverPack Solution.

How can I find out the model of my Wi-Fi adapter if it's not detected?

If the adapter is not displayed even as an “unknown device”, its model can be found out:

1. By laptop/motherboard model (find specifications on the manufacturer’s website).

2. Via the command line: open cmd as administrator and enter:

wmic nic get name, manufacturer, description

3. On the laptop box or in the documentation (if preserved).

If the adapter still doesn't appear after installing the driver, try roll back the system to a restore point created before the error occurred code 45.

Alternative ways to connect to Wi-Fi if the adapter isn't working

If all attempts to restore the Wi-Fi adapter to life have failed, but you urgently need internet access, try alternative connection methods:

1. USB Wi-Fi adapter

The simplest solution is to buy an external Wi-Fi adapter (starting at 300 rubles). It plugs into a USB port and functions as a full-fledged replacement for the built-in module. Popular models:

• 🔌 TP-Link TL-WN725N (compact, supports 2.4 GHz)
• 🔌 ASUS USB-AC53 Nano (dual band, 2.4/5 GHz)
• 🔌 Tenda U3 (budget, with a removable antenna)

2. Connection via Ethernet (network cable)

If the router is nearby, connect the computer to it via LAN cableThis is a temporary solution, but it will provide internet access for downloading drivers or performing diagnostics.

3. Sharing Wi-Fi from your phone

1. On Android: Settings → Wireless & networks → Tethering & portable hotspot → Wi-Fi hotspot.
2. On iPhone: Settings → Personal Hotspot → Allow Others.
3. Connect to the created network from your PC (the password will be shown on your smartphone screen).

4. Powerline adapters (for desktop PCs)

If the router is far away and pulling the cable is inconvenient, use Powerline adapters (For example, TP-Link TL-PA4010). They transmit the internet signal through electrical wiring:

• One adapter connects to the router and the socket.
• The second one is connected to a socket next to the PC and is connected to it with an Ethernet cable.

⚠️ Attention: If you use USB Wi-Fi adapter, but it also gives an error code 45, the problem may be in USB ports or USB controller on the motherboard. Check the port on another device (flash drive, mouse).

When it's time to take your computer to a service center: signs of hardware failure

If none of the above methods helped and the error code 45 still prevents me from connecting to Wi-Fi, maybe the problem is in hardware failureContact the service center if:

• 🔧 The adapter is not detected in any OS. (tried booting from LiveCD Linux).
• 💥 There is visible damage on the motherboard (blackened elements, swollen capacitors).
• 🔌 The Wi-Fi module is disabled even in the BIOS. (cannot enable this option) Wireless LAN).
• 📉 The laptop falls or overheats - this could damage the adapter cable.
• 🔄 USB Wi-Fi adapters don't work either. (problem in USB controller).

The cost of repairs depends on the cause:

Malfunction	Estimated cost of repairs	Deadlines
Replacing the Wi-Fi module (laptop)	1 500 — 3 000 ₽	1–2 days
Soldering work on the motherboard	3 000 — 8 000 ₽	3–7 days
Replacing the Wi-Fi module cable	1 000 — 2 500 ₽	Day 1
Diagnostics + BIOS reflashing	1 500 — 4 000 ₽	1–3 days

Before visiting the service:

• 📋 Write it down laptop/motherboard model.
• 💾 Save important data (in case you reset BIOS or reinstall Windows).
• 🔧 Check if the masters have spare parts for your model (especially relevant for older laptops).

FAQ: Frequently asked questions about error code 45

My Wi-Fi adapter keeps appearing and disappearing in Device Manager. What's wrong?

This is a typical sign unstable contact (for built-in modules) or driver conflict. Try:

1. Disable energy savings for the adapter in the device manager (Properties → Power Management).
2. Refresh Motherboard BIOS (download the firmware from the official website).
3. Check Wi-Fi module cable (relevant for laptops).

If the adapter USB, the problem may be in faulty port or malnutrition (connect it via a USB hub with external power).

I updated Windows and then got code 45. How do I roll back?

Use system restore point:

1. Click Win + R, enter rstrui and press Enter.
2. Select the restore point created before the update.
3. Follow the wizard's instructions.

If there are no restore points, try Revert to a previous version of Windows (Settings → Update & Security → Recovery). This is possible within 10 days after the update.

There's no "Network Adapters" section in Device Manager. What should I do?

This means that Windows does not see network devices at allThe problem may be:

• 🔧 Disabled Windows services (check that the service is Plug and Play launched).
• 💥 Damaged system files (run the command sfc /scannow in the command line as administrator).
• 🔄 Reset BIOS settings (go into BIOS and enable Onboard LAN And Wireless LAN).

If nothing helps, try reinstall Windows with saving files.

Is it possible to connect to Wi-Fi without fixing error code 45?

Yes, but these are temporary measures:

• 📱 Use USB modem (3G/4G) or hotspot on a smartphone.
• 🔌 Connect via Ethernet cable (if the router supports it).
• 🔄 Buy external Wi-Fi adapter (costs from 300 rubles).

However, for full functionality it is better to eliminate the cause of the error. code 45.