
Fix Windows Security Service Unavailable in Windows 11
You open Windows Security and see a red banner: 'Security service unavailable. Restart your devic...
Software troubleshooting desk

You open Windows Security and see a red banner: 'Security service unavailable. Restart your devic...

When Windows Search fails to connect to its online services—like Cortana or web suggestions—it of...

After changing your account password, Outlook may suddenly throw an “access denied” error when tr...

You try to open Outlook and see a message that your data file (.pst or .ost) is locked. Often thi...

You launch Windows Defender Security Center or try to run a scan, and you see a proxy error—somet...

If Outlook suddenly stops connecting, shows repeated password prompts, or behaves oddly after a c...