Ditto, running a (almost fully) patched MSN-Client..
This is somewhere inside the Windows settings.. It deleted a .JPG yesterday... ooh dangerous right?
-- Edit
This is caused by - i think - the "Removal tool for harmfull software", which was updated yesterday.. You could try to uninstall it, but if you're running Automatic Windowsupdate (like I do on my notebook), it'll be installed the next time it updates...