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

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

When Windows updates fail to sync between your devices—for example, a feature update installed on...

If you've changed your indexing options in Windows Search but the settings don't stick, you're no...

If you're stuck at the Windows sign-in screen with an activation prompt that won't go away, you'r...

If you're stuck in a login loop on the Microsoft Store and seeing error code 0x80070424, it usual...

After replacing your motherboard, Windows may show activation error 0xc004c003. This means the ac...