I wasn't planning to log in today but got an e-mail
from this site. Thus my info is missing in some aspects, becausae this is unplanned.
I have recently upgraded to Windows 7. I installed a virus
checker whose name I forget and it went on to check external
drives after checking the system disk. On one of the external
drives it thought that a Progdvb file was a virus and before I
knew where I was it had deleted it.
I'll have to come back to this problem some other time.