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

Enable Windows Security Manually When It Fails to Start

If Windows Security (formerly Windows Defender) fails to start, you may see an error like "This a...

Fix Remote Desktop 404 Error from SSL Certificate Issues

When you try to connect to a remote desktop and get a 404 error, it often points to an SSL certif...

Fix Windows Update Not Downloading: Permission Errors

When Windows Update fails to download files and shows errors like 0x80070005 or 0x80070020, the c...

Fix Command Prompt Version Mismatch & Permission Denied

When you see version mismatch or permission denied in Command Prompt, i...

Fix Chrome ERR_TUNNEL_CONNECTION_FAILED When Using VPN

How to Fix 'File Locked by System' in Windows Defender

If you see an error like "File locked by system" when running a Windows Defender scan or trying t...