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

How to Stop Windows Explorer from Restarting

If Windows Explorer (explorer.exe) keeps restarting—your taskbar disappears and reappears, or you...

Fix Nginx Upstream Connection Refused Error

When Nginx returns upstream connection refused in your error logs, it means Nginx tr...

Fix Chrome Hardware Acceleration Black Screen in Windows 11

If Chrome shows a black screen on Windows 11, especially after an update or when playing video, h...

Fix Cloudflare Wildcard Subdomain Origin Server Errors

You set up a wildcard DNS record in Cloudflare (e.g., *.example.com) pointing to you...

How to Fix Windows Update Stuck with Error 0x80070002

If Windows Update is stuck and you see error 0x80070002, the system is usually having trouble fin...

Fix Git Push Rejected Non Fast Forward Error