I have a Dell XPS400 that had a virus and removed all Icons from the desktop.  The hard drive was removed and scanned and cleaned in another PC.  Then reinstalled in original PC and attempted a Repair/Reinstall of Windows XP Media Center.  However, during the attempt to reinstall the Raid driver (supplied by Dell drivers/download website) the "setup fails to find any hard disk drives installed in the computer".  Any help would be greatly appreciated.