
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 Windows Update shows “cannot connect to update server,” you may see error codes like 0x80072...

When migrating Chrome to a new computer or profile, you might see error messages like "Your profi...

If the Windows Security app (Microsoft Defender) is missing, won’t open, or shows errors, reinsta...

You're browsing and suddenly see "404 Not Found" in Chrome. The page won't load. This error means...

If you see error 0x80070422 when opening Windows Defender or running a scan, it usually means the...