I’ve tried to “replace” xml files and erscan c:\windows.
Result : 7530 files not tested.

Another problem : when I’ve started Avast! Antivirus to scan the folder, I’ve got a message telling me there’s a virus in memory. It asked me some questions and restarted my computer. No problem : all files are safe
( I suppose ) .

But I haven’t found any information in log about this alert.