Command Prompt Troubleshooting Checklist for Beginners
When your Windows computer starts acting up—slow performance, error messages, or network problems...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Windows Defender Not Starting Automatically
If Windows Defender (Microsoft Defender Antivirus) isn't starting automatically when you boot you...
Fix 'Windows License Expired' Error on Activated Systems
You see a watermark or notification saying your Windows license has expired, but when you check S...
How to Fix a systemd Service Restart Loop
You start a systemd service and it immediately restarts, or it runs for a few seconds and then re...
Fix Windows Search After Disabling Cortana
If you've disabled Cortana and find that Windows Search no longer returns results or runs slowly,...
How to Fix Outlook Rate Limit Error After Update
After a recent Outlook update, you might see a rate limit error when sending or syncing email. Th...
Topic paths
Quick titles
Fix Firefox Profile Not Found in Windows 10Windows Defender Toggle Not Staying On: TroubleshootTroubleshoot Windows Activation Restore Error 0x80070057Fix Access Denied After Windows Hardware ChangeDisable BitLocker High MemoryHow to Fix BitLocker Invalid ConfigurationStop Chrome Freezing on Startup: 8 FixesFix OneDrive Not Signing In Due to Network Firewall