Knowledge base for software setup, errors, and daily tool work.

Fix Windows Security App Blocked by Antivirus

You open Windows Security (formerly Windows Defender) only to see an error or blank screen becaus...

Windows Security App Not Opening: Practical Fixes

If the Windows Security app won't open—clicking the icon does nothing, or it crashes immediat...

Fix Nginx 502 Bad Gateway on Docker Ubuntu

Fix Docker Volume Permission Denied in Containers

You start a container with a bind mount volume, and the application inside can't write to it....

Fix Windows Update Service Not Running for System Restore

You might see “System Restore did not complete successfully” or “Windows Update service is not ru...

How to Clear DNS Cache to Fix ERR_NAME_NOT_RESOLVED

You try to visit a website, but Chrome shows ERR_NAME_NOT_RESOLVED or your brows...