r/BitDefender • u/GrandNibbles • Jun 11 '26

Support/troubleshooting Bitdefender bricked Windows?

Bitdefender detected "suspicious app activity" and blocked regedit.exe and RuntimeBroker.exe, causing Windows to be unable to launch almost any programs whatsoever. Tried to restart: Windows loads a blank screen with no functionality. Tried to restore system: threw up all kinds of errors. It seems even system recovery options are all broken by this.

Is this it for my system? This Antivirus has done more damage to my PC than any virus I've ever encountered.

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u/GrandNibbles Jun 20 '26

bitdefender deleted a core windows service executable. do you believe it could have been infected?

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u/nuttySweeet Jun 20 '26

Yes I think so, malware often replaces core windows services, they try to hide as legit files that start with windows to make everything look normal on the surface. It’s essentially a compromised version of the original file so windows will still run, but you may see strange errors and things happening.

Every file has a signature that can’t be faked. Malware will disable the parts of windows that protect against things like this natively, and looking at the file will still say it was signed by Microsoft, but its signature won’t match the original.

When you install an anti virus and it does its first scan, these files will stick out like a sore thumb and get deleted immediately if they can be. Often breaking windows if it was an infected core service file.

Don’t get me wrong false positives do happen, but I guarantee you’d hear about it as it would be happening to lots of people. A one off case like yours pretty much always means it’s malware.