Fix Windows Security Service Not Starting
You open Windows Security and see an error that the service isn't running. Or you get a notificat...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Microsoft Store Update Error 0x80073cf0
You're trying to update an app in the Microsoft Store and get error 0x80073cf0. This usually happ...
How to Fix Windows Security Access Denied on Startup
If you see an "Access Denied" error when Windows Security tries to open at startup, the antivirus...
Fix OneDrive Not Syncing Despite Internet Connection
You have a working internet connection—other sites load, email works—but OneDrive shows a sync er...
Fix Windows Security Authentication Error 0x80070035
When you try to access a shared folder or printer on another computer, you might see an error:
Fix Windows Activation SSL Certificate Error After System Restore
After performing a system restore, some users encounter an SSL certificate error when trying to a...
Topic paths
Quick titles
How to Fix Windows Defender Permission Denied Scanning ErrorsStep-by-Step Guide to Set Up BitLocker Backup to an External DriveFix Task Scheduler Locked File ProblemsFix Windows Search by Rebuilding Index with CMDFix Windows Update Keeps Reverting ChangesHow to Resolve OneDrive Sign-In Permission ErrorHow to Resolve Activation Service Unavailable ErrorMigrating Task Scheduler Jobs: Common Trigger Failures