Fix Windows Defender 404 Not Found Error on Windows 10
You click to open Windows Defender Security Center and see a 404 page, or the Settings app shows ...
Software comparisons, alternatives, and tool decision notes.
Fit
Decision
Migration
Latest comparisons
Browse labHow to Fix Windows Update Error 502 Bad Gateway
Windows Update may show a 502 Bad Gateway error when the update service cannot reach Microsoft's ...
Windows Defender Not Opening? Here's How to Fix It
You click the Windows Defender icon, but nothing happens—or you get an error saying the app didn'...
Fix Windows 10 Activation Authentication Failed After Update
After a Windows 10 update, you might see an activation error like "We can't activate Windows on t...
Fix Windows Security Access Denied for Administrator Account
You're logged into Windows with an administrator account, but Windows Security still shows 'Acces...
How to Fix OneDrive Files Not Syncing in Windows 10
OneDrive not syncing files on Windows 10 is a common frustration. Files may show a spinning circl...