How to Fix 'Command Not Found' in Command Prompt
You type a command in Command Prompt and get 'xxx' is not recognized as an internal or exte...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Locate Task Scheduler History Log in Windows 10
If you've set up scheduled tasks in Windows 10 and they're not running as expected, the Task Sche...
Fix Windows Security Service Not Running for Antivirus
If Windows Security shows 'Service not running' or your antivirus isn't working, the underlying s...
Fix Windows Activation Error: Permission Denied
You attempt to activate Windows and see an error message: “Permission denied” or “Access denied.”...
Fix Firefox Not Responding: Disable Hardware Acceleration
If Firefox frequently stops responding, freezes, or shows a "Not Responding" message, hardware ac...
How to Fix Windows Security 404 Not Found Error
If you see a '404 Not Found' error when opening Windows Security (formerly Windows Defender), the...
Topic paths
Quick titles
How to Enable PowerShell at System StartupHow to Fix 'The System Cannot Find the Path Specified'Troubleshoot OneDrive Sync Failure: Firewall and Network IssuesPowerShell Permission Denied Error When Opening: FixesFix Chrome Profile Corruption Step by StepFix Windows Defender Token Expired Group Policy ErrorHow to Start the Windows Update Service When It StopsBitLocker Sync Timeout Fixes