Well it sounds like PBM isn't on your computer now. If this is software you had purchased you could contact the manufacturer.
No I didn' buy the software, it came on my computer.
Another thing you can do is convert the file to WMV, which is what WMM will understand. Like for example, if you have .avi files, you can get something that will convert it to WMV. .avi can be called divx or xvid too. These are two related codecs. If you look around you should be able to find file converters
WMV!!!! I know what that is, that's what PMB always converted my videos to before I lost it. I don't recognise .avi or the other two though?
Actually the first one I haven't tried yet, I'm downloading it right now.