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

Fixing WinRAR Checksum Errors When Extracting RAR Archives

You're extracting a RAR archive and WinRAR stops with a "checksum error" message. This usually me...

Fix Microsoft Store Not Launching from Start Menu

You click the Microsoft Store icon in the Start Menu, but nothing happens—no window, no error. Th...

Fix VirtualBox Kernel Driver Not Installed on Windows 10

UFW Port Closed Despite Allow Rule: Fixes

You've added a UFW allow rule for a port, but a port scan or service test shows the port is still...

Fix Windows Update 404 Not Found Error on Windows 11

If you see a "404 Not Found" error when running Windows Update on Windows 11, it usually means th...

Fix Windows Update Proxy Error on Windows 10

If you see a proxy error when running Windows Update on Windows 10, it usually means the system c...