Fix Windows Security 404 Not Found on Startup
When Windows Security shows a 404 error on startup, it typically means the app can't find its req...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Windows Activation Authentication Failed Error
You see "Authentication failed" when trying to activate Windows. This usually happens after a har...
Fix Windows Search Not Showing Results Due to Permission Errors
You type a query into the Start menu or File Explorer search box, but no results appear—or only p...
Fix Microsoft Teams Blank Screen on Mac: Step-by-Step
When you open Microsoft Teams on a Mac and see only a blank white or gray screen, the app is usua...
Fix Windows Terminal 502 Bad Gateway Due to Proxy or Network Settings
You open Windows Terminal and see a '502 Bad Gateway' error when trying to access a remote host o...
Fix OneDrive Error 0x8007016a Not Syncing
You see OneDrive error 0x8007016a and your files stop syncing. Usually this means OneDrive can't ...
Topic paths
Quick titles
How to Install SSL Certificate for Remote DesktopWindows 11 Update Slows Command Prompt: FixesResolve 'Permission Denied' Error in PowerShell SettingsBreaking a Task Scheduler Credential LoopChecklist for Resolving PowerShell Version MismatchesFix PowerShell Cannot Connect to Localhost Due to FirewallChecklist for Outlook Email Not Receiving IssuesWindows Defender for Mac: Installation Guide