Windows 10 will block some apps it thinks are dangerous, but there is a workaround.

Learn how to bypass This app has been blocked by your system administrator in Windows 11/10 by creating a new rule in Local Security Policy.

If Windows Defender is blocking Avast antivirus, you can add the blocked file as an exception in Windows Security. Here are some more fixes.

Microsoft is investigating a known issue preventing the Windows Sandbox and Windows Defender Application Guard (WDAG) from opening on some Windows 10 devices.