Fix Windows Defender Not Starting After Update
After a Windows update, you might see that Windows Defender (now called Microsoft Defender Antivi...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Microsoft Store Rate Limit Error
You're trying to download or update an app from the Microsoft Store, and you get a message about ...
Fix Windows Security Service Not Starting Error
You click the Windows Security icon, but it doesn't open. Or you see an error saying the service ...
How to Fix Slow Windows Defender Scan Speed
If your Windows Defender (Microsoft Defender Antivirus) scan is taking much longer than usual—som...
Fix Task Scheduler Task Not Running Due to Permission Denied
You set up a scheduled task in Windows Task Scheduler, but it fails with a 'permission denied' er...
Fix Windows Search Port 80 Already in Use Error
You’re trying to start Windows Search or an indexing service, and you see an error like “Port 80 ...
Topic paths
Quick titles
Fix a Frozen Windows Security Virus ScanFix Chrome 502 Bad Gateway Due to Proxy SettingsFix BitLocker Path Not Found on External DriveHow to Fix Outlook Permission Denied Sending EmailFix Chrome Rate Limit Error: Step-by-StepFix PowerShell Port Already Allocated After RebootHow to Reset Command Prompt Window Size and ColorsTask Scheduler Stops After Windows Update: Fix