WindowBlinds relies on Themes and DwmApi. Corruptions here can trigger false positives.

Open Command Prompt as Administrator and run the following commands sequentially:

net stop themes
net stop dwm
net start themes
net start dwm
sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth

After the DISM and SFC scans repair any Windows corruption, reboot and reinstall WindowBlinds again.

The error message itself suggests this, and it’s often the fastest fix.

This reinstalls Windows without deleting your apps or files. It replaces all core system files, wiping any corruption.