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FIX: Windows Defender error 0x800b0100
4 min. read
Updated onApril 3, 2024
updated onApril 3, 2024
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Key notes
Windows 10is an extremely versatile and self-sufficient OS. One of the biggest testimonies to that fact is that it comes with a very efficient built-in protection system called Windows Defender.
However, things don’t always go smoothly forWindows Defender. For example, some users have reported receiving a Windows Defender error code 0x800b0100 when trying to launch the program.
Thiserrorwill prevent you from turning on Windows Defender, rendering you defenseless. Since this is a very problematic issue that completely blocks the functionality of a vital Windows component.
That is why we’ve created this step-by-step guide that will show you exactly what you need to do.
How do I fix Windows Defender Error 0x800b0100?
1. Perform a Clean Boot
By following these steps, you should be able to see whether a third-party application was blocking Windows Defender. If this is indeed the cause, reverse the changes you’ve made for each program.
It is best if you reverse the process one at a time to determine which program exactly is causing the issue.
2. Check your Windows Defender Service
You need to check whether or not the Windows Defender processes are working by performing the steps above.
4. Check your PC for malware
Quite ironically, this Windows Defender error can be caused by an already-present infection of your Windows 10 PC.
As such, simply install a very good third-party antivirus to perform a complete scan and cleanup of your Windows system.
The tool recommended below is the best you can get on the market within a reasonable budget. Its multi-layered security technology ensures perfect protection.
So not only that you will eliminate any possible malware infection but you will also fix the Windows Defender error in no time.
ESET HOME Security Essential
5. Perform an SFC scan
The System File Checker scan will detect any possible corrupted system files and will repair them, setting things right again.
6. Perform a DISM
By following these steps, you should be able to fix the Windows Defender error 0x800b0100 and enjoy a malware-free PC experience.
If you still can’t get it to work or if you’re tired of such errors, consider switching to another antivirus. Take a look at our great selection of thebest unlimited licence antivirusesthat we prepared for you.
Which of the methods listed above worked for you? Let us know in the comments section below.
More about the topics:Windows Defender issues
Teodor Nechita
Eager to help those in need, Teodor writes articles daily on subjects regarding Windows, Xbox, and all things tech-related.
When not working, you may usually find him either at the gym or taking a stroll in the park, trying to find inspiration for the next articles he may write.
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