PC FixAbout this list
The list above has every problem on the site, grouped by kind. The box filters it as you type: try a stop code such as "CRITICAL", a message such as "not recognised", or a plain word such as "printer" or "slow".
If you cannot find your exact message, look for the kind of problem instead. Windows has thousands of error codes, but they come from a small number of causes, and the pages here are organised by cause:
| What is wrong | Usual causes | Start with |
|---|---|---|
| Will not start | Start-up files, a bad update, the disk, power | Automatic repair loop, PC will not turn on |
| Blue screens | Drivers, memory, disk, heat | Blue screen stop codes |
| Slow | Too many programs, a full or old disk, too little RAM | Slow computer |
| No internet | Router, DNS, adapter driver | Wi-Fi connected, no internet |
| A device does nothing | Wrong device chosen, a switch, a driver | The page for that device |
| A program will not start | Missing runtime files | 0xc000007b, missing DLL |
Reading an error message
Three parts of a Windows error are worth noting before you search:
- The words, exactly as shown: "was not found", "is not responding", "access is denied".
- The code, if there is one: a stop code in capitals with underscores, or a number beginning 0x.
- The name of a file or program mentioned in it.
Take a photograph of the screen with your phone. Error screens often vanish before they can be read.
My error is not listed. What should I do?
Try the three basics first: restart, install updates, undo the last change. Then run the repair commands. Those four steps resolve a large share of faults whatever the message.
Should I search for the error code online?
Yes, but prefer Microsoft's own support pages, and be wary of sites that answer every code with "download our repair tool".
For Windows 11 and Windows 10. Written in November 2026. Menus move between updates; use the search box in Settings if a name differs. Back up important files before any step that resets, repairs a disk or opens the computer. This is an independent guide, not connected with Microsoft.