
Fix 'Windows Security App Not Installed' on Windows 10
You open the Start menu, search for Windows Security, and nothing shows up. Or you see a message ...
Software troubleshooting desk

You open the Start menu, search for Windows Security, and nothing shows up. Or you see a message ...

You try to open Windows Defender Security Center or run a scan, but get an 'Access Denied' error....

You try to join a meeting or share a file, and Teams shows an error about version mismatch. This ...

If the Microsoft Store app won't open or gets stuck on a blank screen, it's often due to a corrup...

When setting up an email account in Outlook, an SSL certificate error can block the connection. Y...

When Windows Search throws an SSL certificate error—often as 'The certificate is not valid' or 'A...