Thanks for the replies guys. Am running Win98 and I have done an internal search of the C drive. I don't know if this was a file I had and lost, or if this is a file I never had. Google tells me what it is, and what I need it for, but not how to get it.
The All Drivers site doesn't have it and apple support don't seem to reply to emails.
I am also beginning to think corruption otherwise why don't the other programs for .AVI work?
I have scanned all files for viruses and update the NAV every 2 days.
So where do I go from here?