
Windows Security Troubleshooting Checklist
If Windows security features aren't working as expected—like Windows Defender won't start, update...

If Windows security features aren't working as expected—like Windows Defender won't start, update...

When Microsoft Teams opens to a blank screen, hangs on the loading spinner, or crashes before ful...

If Microsoft Teams opens briefly then closes, or fails to start at all, the problem is often loca...

If you need to find your Windows version, edition, or build number from the command line, PowerSh...

When Windows Search stops returning results or the search box becomes unresponsive, the cause is ...

You try to activate Windows and see an error saying “invalid configuration”. Thi...