# How to Fix mountmgr.sys BSOD Error on Windows 10 & 11
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## What is a BSOD?
A Blue Screen of Death (BSOD) error, also known as a blue screen or blue screen of death, is an error that occurs when the operating system kernel has a problem and cannot continue. The screen turns blue, and you are unable to interact with the computer.
## Common causes
– A driver issue
– A hardware conflict
– Corrupt or missing files
– A bug in Windows 10/11
– A buggy third-party application
– A virus or malware infection
– A failing update
– A problem with a device, such as a graphics card or monitor
– A problem with the display cable
## How to fix it
### Check for updates
If you have an older version of Windows 10 or 11, check if there is an update available. If so, install it and restart your computer.
### Restart in Safe Mode
Restarting in safe mode can help you determine whether the issue is caused by a third-party application or driver. To do this:
1. Press `Win + R` on your keyboard.
2. Type **msconfig** into the search box and press Enter.
3. In the System Configuration window, click the **Boot** tab.
4. Under Boot options, check the **Safe boot** option and click OK.
5. Restart your computer.
### Check for driver updates
If you have a graphics card or monitor that is not compatible with Windows 10/11, update its drivers to the latest version.
Last Updated: December 11, 2025
Tested on: Windows 10 (22H2) & Windows 11 (23H2)