How to fix FBNetFit.sys Blue Screen in Windows?

What causes How to fix FBNetFit.sys Blue Screen in Windows?

FBNetFit.sys driver fails to load or run
Enabled Network Boost in Lenovo Vantage
Outdated Lenovo Gaming NetFilter Device driver
Issues with the Lenovo Vantage application

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Hello. I just received an FBNetFit.sys Blue Screen error on my Windows computer. How can I fix this?

A blue screen occurs when Windows encounters something known as a "STOP Error.” This critical failure causes Windows to crash and stop working. The only thing Windows can do is restart the PC. This can sometimes lead to data loss as active apps do not have a chance to save the data.

Recently, some users encountered a FBNetFit.sys Blue Screen in Windows. FBNetFit.sys is a digitally signed driver[ref en-1] file from Lenovo installed by the Lenovo Vantage App. If the driver file fails to load or run on your system, it causes a Blue Screen error. The issue might be caused by the enabled network boost or other issues with the Lenovo Vantage application.

Enabled Network Boost automatically prioritizes games to the highest level within your network, maximizing the speed. If you are using any apps while gaming. The error could also be caused by an outdated Lenovo Gaming NetFilter Device driver.

In this guide, you will find 4 steps that should help you get rid of the FBNetFit.sys Blue Screen. Manual troubleshooting can be a lengthy process. You can use a maintenance tool like [d1]. It can fix most system errors, BSODs,[ref en-2] corrupted files, and registry[ref en-3] issues automatically. Otherwise, follow the step-by-step instructions below.

How to fix fbnetfit sys blue screen in windows

Method 1. Disable Network Boost in Lenovo Vantage

Open the Lenovo Vantage application
Disable Network Boost

Method 2. Uninstall Lenovo Vantage

Open Settings
Go to Apps, then Apps & Features or Installed Apps
Look for Lenovo Vantage
In Windows 11, click on the three vertical dots and select Advanced Options
In Windows 10, Select the app and select Uninstall

Method 3. Reinstall Lenovo Gaming NetFilter Driver

Open Device Manager by searching it out from the Start Menu
Expand System Devices
Look for Lenovo Gaming NetFilter Device

Right-click on it and select Uninstall device
Click Uninstall again to confirm
Restart your device and see if the driver is reinstalled
You can also use a dedicated utility like [rev id="DriverFix"] that can find the best drivers for your device and install them automatically

Method 4. Use System Restore

Type in Create a System Restore Point in Windows search and hit Enter
Click on System Restore
Select Choose a different restore point (if available) and click Next
Mark the Show more restore points checkbox

Choose the date before you start experiencing the issue
Click Next and reboot the system as required

Bottom line

To fix the FBNetFit.sys Blue Screen error, you can disable Network Boost in Lenovo Vantage, uninstall Lenovo Vantage, or reinstall the Lenovo Gaming NetFilter Driver. If these steps do not resolve the issue, consider using a maintenance tool to fix system errors automatically.

Frequently asked questions

What causes the FBNetFit.sys Blue Screen error in Windows 10?

The FBNetFit.sys Blue Screen error is often caused by outdated or incompatible network drivers, particularly related to the Intel or Realtek network adapters in Windows 10.

How can I update the FBNetFit.sys driver to resolve the blue screen issue in Windows 11?

To fix the FBNetFit.sys blue screen in Windows 11, go to Device Manager, locate your network adapter, right-click it, and select 'Update driver' to search for the latest version.

Is there a way to fix the FBNetFit.sys error without accessing Windows 10?

Yes, you can boot into Safe Mode or use a Windows recovery drive to access troubleshooting options and attempt to fix the FBNetFit.sys error without fully loading Windows 10.

Did this fix work for you?

Written & verified by

Ryan Mitchell

Hardware & Driver Specialist

Hardware troubleshooting Driver installation and rollback Device Manager errors USB and peripheral issues Firmware updates

Ryan Mitchell specialises in hardware troubleshooting and driver management for Windows systems. His expertise covers device recognition failures, driver conflicts, firmware updates, and peripheral connectivity issues across all major manufacturers. Ryan's systematic approach to hardware diagnosis — starting with Device Manager, working through driver rollback and clean installs, and escalating to BIOS-level checks — has made his guides a reliable resource for both home users and field technicians. He covers GPUs, printers, audio devices, USB controllers, network adapters, and external storage.

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