CCleaner does not remove all analyzed files

After running Analyze, and then Run Cleaner, I have 361.4MB of WINNT/Temp files remaining that were not removed.

When I run the procedure again, it still leaves the 361.4MB not removed.

All other processes including Firefox are closed when I run CCleaner.

I have uninstalled and reinstalled, but nothing changes.

All options are unchecked except "Show prompt to backup registry issues."

I did an Issues scan and fixed all issues.

What else is there to do to remove those Temp files?