Fix Windows Defender 404 Not Found After Update
After installing a recent Windows update, some users find that Windows Defender is missing or sho...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Git Clone Permission Denied (publickey) on Mac
When you run git clone and see Permission denied (publickey), Git canno...
Fix OneDrive Sync Error 0x8004de40 During Migration
When migrating OneDrive accounts or moving files between tenants, you may see error 0x8004de40. T...
Fix Port Already Allocated Error for Windows Update on Windows 10
You try to run Windows Update but get an error message like 'port already allocated'. This usuall...
Fix Windows Defender Error 0x800106ba: Failed to Start
If you see “Windows Defender failed to start” with error code 0x800106ba, the Windows Defender se...
How to Fix ERR_NETWORK_CHANGED in Chrome
You're browsing in Chrome and suddenly a page fails to load with the error "ERR_NETWORK_CHANGED"....
Topic paths
Quick titles
Troubleshooting Invalid Activation Configuration After UpgradeAccess Denied Error When Activating Windows 10How to Fix Microsoft Teams DNS ErrorWindows Defender Real-Time Protection Error 0x80070422 FixOutlook Not Sending Emails: Practical Fixes for Common CausesHow to Repair Command Prompt After UpdateHow to Resolve pgAdmin Server Connection Failure on Port 5432How to Unlock Microsoft Store Setup Error