Answer a few questions about boot status, timing, and the exact stop message. The result is decision support, not an automated diagnosis.
Protect your files first
Back up important files when possible. If the drive is encrypted, locate the BitLocker recovery key before recovery changes. Stop if storage appears to be failing or this is a work or school managed PC.
Use the tool
How to interpret the result
A stop error can come from hardware, drivers, or software. The questions choose a lower-risk next step, not a probability of a cause.
Protect your data
This tool reads the values you enter in your browser. It does not connect to your PC, execute a command, upload a dump, or collect a recovery key. Keep passwords, product keys, and serial numbers out of public search fields.
Keep track of your checks
This checklist stays in this browser session. It is not sent to WinErrors.