Fix Windows Security Not Starting Due to Third-Party Antivirus
If Windows Security (formerly Windows Defender) refuses to start or shows a blank screen, a third...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix Chrome Profile Error 0x80070057: Startup Failure
When you start Chrome and see “Your profile could not be opened correctly” or “Chrome profile fai...
Fix Task Scheduler Not Working After Windows Update
After a Windows update, you might find that scheduled tasks no longer run, or the Task Scheduler ...
Fix Windows Update Error 0x800f0831: Missing Component
When running Windows Update, you may see error 0x800f0831 with a message that a component is miss...
Fix Windows Defender Access Denied Error on Startup
If you see 'Windows Defender failed to start access denied' when you open Windows Security or aft...
Fix Windows Security Error 0x80073b01
You try to install or update an app from the Microsoft Store, and Windows Security throws error 0...
Issue queue
SitemapWindows Search Index SSL Configuration Troubleshooting
How to Resolve Windows Activation 502 Bad Gateway Error
SSH Key Troubleshooting: Permissions & Ownership Guide
Windows 10/11 Activation 502 Bad Gateway Fix
Ubuntu Permission Denied Error When Downloading Windows Updates
Windows Defender Firewall Blocking Internet? Here's How to Fix
Windows Security Not Working After Update? Try These Fixes
How to Stop Windows Update from Starting Automatically
Configure Windows Update to Notify Only
How to Get Windows Security Running Again
Windows Defender Offline Scan Setup Guide
Resolving Remote Desktop Connection Timeouts
How to Resolve Windows Activation 502 Bad Gateway Error
SSH Key Troubleshooting: Permissions & Ownership Guide
Windows 10/11 Activation 502 Bad Gateway Fix
Ubuntu Permission Denied Error When Downloading Windows Updates
Windows Defender Firewall Blocking Internet? Here's How to Fix
Windows Security Not Working After Update? Try These Fixes
How to Stop Windows Update from Starting Automatically
Configure Windows Update to Notify Only
How to Get Windows Security Running Again
Windows Defender Offline Scan Setup Guide
Resolving Remote Desktop Connection Timeouts