Fix OneDrive Sync Error 0x8004de40 (SSL Certificate)
If you see error 0x8004de40 when syncing OneDrive, it usually means your computer cannot verify t...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Windows Security 404 Not Found Error
If you see a '404 Not Found' error when opening Windows Security (formerly Windows Defender), the...
Fix Windows Defender Security Center Module Missing Error
You open Windows Security and see a blank page or an error saying the security center module is m...
Fix Microsoft Teams Authentication Failed After Password Change
After changing your Microsoft 365 or corporate password, you may see an authentication error in M...
Fix Windows Terminal Stuck on Splash Screen
Windows Terminal opens to a splash screen and then hangs—no cursor, no tabs, just the logo. This ...
BitLocker Not Working on System Drive: Fix Guide
If BitLocker won't turn on, keeps asking for a recovery key, or shows errors on your C: drive, yo...
Topic paths
Quick titles
Outlook Setup Permission Denied: Causes and FixesFix Remote Desktop Permission Denied in RDP FilesStop Windows Update from Using Data on Metered Wi-FiFix Task Scheduler Token Expired Permission Denied ErrorGitLab Runner Configuration for Queued JobsOneDrive Sync Settings Won't Save After ResetHow to Fix Windows Store Download Stuck IssuesHow to Clear Windows Defender Protection History Log