Avast Clean up Premium

Just installed the latest version of Avast Clean Up Premium.
Trying to do a scan on the non necessary system files and scan stops always on the file c:windows\write.exe.
All other functions are working OK including the removal of the browserfiles.
Suggestions?

Hi, see: https://forum.avast.com/index.php?topic=222373.msg1479330#msg1479330