
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...

After a Windows update, you might notice your computer running slower and the fan spinning louder...

When you see Windows activation error 0x8007000d with a message like connect...

If you've disabled Cortana and find that Windows Search no longer returns results or runs slowly,...

When you try to start a service or application and see "port already allocated" or similar, it me...

Network Protection in Windows Defender helps block outbound connections to malicious IPs and doma...