Does Windows Defender conflict with Avast?
How do I fix Windows Defender blocking Avast in Windows 10/11?
Besides, there is a common complaint Windows Defender blocking Avast.
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Avast and Windows Defender conflict, as a result, Windows Defender blocks Avast.
Also, the version of Avast is outdated.
What should you do if Avast opens to blank white screen in Windows 11/10?

From this post, you’re free to find out some effective ways to solve it.
So, the best way is to uninstall Avast and remove all the remaining files from your Windows 11/10.
Step 2: PressWin + R, typemsconfigand clickOK.
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Then, chooseSafe bootunder theBoottab, clickOK, and restart the PC to Safe Mode.
Step 3: Right-choose the .exe file you have downloaded and chooseRun as administrator.
Step 4: Choose your Avast product, click theUninstallbutton to uninstall Avast and clear all the files.
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This post shows you multiple methods for this work.
Disable Windows Defender
When Windows Defender conflicts with Avast, it may block Avast from functioning properly.
it’s possible for you to venture to disable Windows Defender to fix this issue in Windows 10/11.

Step 1: TypeWindows Securityinto the Windows search bar and open this antivirus program.
Step 2: ClickVirus & threat protection > Manage tweaks.
Try solutions in this post now.

Step 3: Under theReal-time protectionsection, disable this feature.
If asked byUser Account Control, clickYes.
To fix this issue, it’s possible for you to give a shot to stop Insider Preview builds.
Step 2: Click theStop Insider Preview buildsbutton and clickYesto confirm.
Step 3: ChooseRoll me back to the last Windows release.
Step 4: Restart the PC and revert it to the latest stable build.
However, only running antivirus software is not enough to safeguard your important data.
So, you had better back up your important data regularly.
To do this thing, MiniTool ShadowMaker can be a good option.
Scheduled backups and differential/incremental backups are supported.
Just download this software to have a try.
The answer is yes and you may often encounter the issue of Windows Defender blocking Avast in Windows 10/11.
After reading this post, you know some methods and just try them to get rid of trouble.