Checklists for software errors, setup, and tool workflows.

Fix BitLocker Recovery Key Access Denied Errors

You're locked out of a BitLocker-encrypted drive and see an "access denied" message when trying t...

Fix CMD Service Unavailable Due to Group Policy

Situation

You open Command Prompt and see an error like "Command Prompt has been disabled...

BitLocker Recovery Key Not Accepted: 504 Error Fix

You enter your BitLocker recovery key, but get a 504 error. The key is not accepted. This usually...

Fix Windows Search 502 Bad Gateway After Update

After a recent Windows Update, you might see a “502 Bad Gateway” error when using Windows Search....

Fix Windows Search Network Error After Update

After a recent Windows update, you might see a network error when using Windows Search—for exampl...

Fix Windows Defender Version Mismatch with Configuration Tool

You might see a version mismatch warning when opening Windows Defender Security Center or running...