Checklists for software errors, setup, and tool workflows.

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Windows 11 Installation Assistant Stuck at 99%: Fixes That Work

You’re upgrading to Windows 11 via the Installation Assistant, and it gets stuck at 99%. The prog...

Fix Windows Defender Real-Time Protection Stuck on Turning Off

You open Windows Security, go to Virus & threat protection, and see Real-time protection stuc...

How to Fix Nginx Upstream Connection Refused on Port 80

When nginx logs show "upstream connection refused" while connecting to port 80, it means ...

Chrome Memory Not Decreasing After Closing Tabs – Fixes

You close a dozen tabs, but Chrome still eats 2 GB of RAM. This is normal up to a point—Chrome ca...

Python Memory Error When Processing Large Text File: Fixes

You're processing a large text file in Python, and suddenly you hit a MemoryError

How to Fix Windows Explorer Error 0xc0000005 on Restart
If Windows Explorer keeps restarting and you see error 0xc0000005, it usually means a critical pr...