I am unable to transfer any video from the PC to Tivo series 3. I keep getting a message in the TO Do list that the file was deleted because space was needed. The timestamp is the same second I try to transfer. This message doesn't make sense because I have lots of free space. My guess is the the files on the PC might be corrupted even though they were just encoded and I transferred these types of files many times before. Is there a utility in Windows to verify the video file is valid file which Tivo can understand?