dotzukko

hi, i don't know if this has already been fixed or reported, i have all updates installed. when i open an explorer window, i click on a file and on the status bar i get the file size, (let's say 200kb), i press F5 or refresh an i click on the same file and now i get a file size of 400kb ( it doubles ). any hints on how to fix this ? im using windows 2008 server, datacenter edition, genuine