If you decide to do this, here’s a quick guide on how to stop getting Insider builds: If you want to stay away from these kinds of problems, the best approach is to move away from the Insider program and start using the latest stable Windows 10 build. This issue is occurring because of the instability that many Insider builds have. Please follow each potential fix in order until you find a method that stops Windows Defender from blocking Avast’s VisthAux.exe. Below you have a couple of fixes that users in a similar situation have used to fix this behavior. If you’re third party Avast antivirus is being blocked by the built-in Windows Defender antivirus, there are a few methods that you can follow to resolve the issue. Because of this, using 3rd party anti-virus programs with Insider builds and Pre Release builds is less than ideal. Insider builds and technical previews are not properly tested and often spawn a wide array of unexpected problems. The error message associated with this issue is “ Your organization used Windows Defender Application Control to block this app“.Īfter investigating the issue, it’s very likely that the issue is exclusive to Windows 10 and only occurs on Technical Preview and Insider builds. There’s been a recurrent issue with Avast antivirus where one of its executables ( visthaux.exe) is blocked from running by Windows Defender.