🔍 Free Diagnostic Tool

Diagnose Your Windows Error

Answer a few questions to identify and fix your error — or search directly below.

🤔 When does this error happen?

Select the situation that best matches your problem.

🖥️
During startup or boot
Computer won't start properly or shows error at login
📱
When opening/running a program
Application crashes, won't open, or shows an error dialog
🌐
Network or Internet related
Can't connect, slow connection, or network error messages
📁
File or disk operation
Can't access files, disk full, permission denied
🔄
During Windows Update
Update fails, gets stuck, or throws an error code
💀
Blue Screen of Death (BSOD)
Computer crashes with a blue screen and error code

📋 What kind of error message?

Tell us more about how the error appears.

🔢 Do you see an error number?

Many Windows errors include a numeric code (like 0x80070005 or Error 5).

Yes, I have an error code
I can see a number in the error message
No, no code visible
Show me the most common errors for my situation