Fix Windows Security 404 Error & Missing Files
If you see a 404 error in Windows Security or get messages about missing files, the Security Cent...
Software comparisons, alternatives, and tool decision notes.
Fit
Decision
Migration
Latest comparisons
Browse labHow to Reinstall Windows Defender in Windows 10
Windows Defender (now called Microsoft Defender Antivirus) is built into Windows 10 and typically...
BitLocker Recovery Key Not Accepted? Fix TPM Issues
You enter your BitLocker recovery key, but Windows rejects it. This often points to a TPM (Truste...
Fix 'Permission Denied' Error on Windows Update Log File
When you try to open the Windows Update log file (usually %windir%\WindowsUpdate.log...
Fix 504 Gateway Timeout After Windows Update
After installing a recent Windows update, you might see a 504 Gateway Timeout error when browsing...
How to Fix Windows Defender Cache Not Clearing
If you've noticed that Windows Defender isn't releasing disk space after a scan or that the cache...