Fix Windows Defender Real-Time Protection Stuck on Scanning - Windows Security Real-Time Protection Slowing Down Your PC-OneDrive Error 0x8004de40: How to Fix Sync Problems

Updated 2026-06-19 02:22:44cloud-software
Fix Windows Defender Real-Time Protection Stuck on Scanning - Windows Security Real-Time Protection Slowing Down Your PC-OneDrive Error 0x8004de40: How to Fix Sync Problems
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.