Wordfast and Vista

I wasn't sure which forum to send this question to. I hope that a fellow Wordfast user reading this might know what to do.

Wordfast worked fine on my old computer (XP), and initially even on my Dell/Vista/Norton combo, but while I was in hospital and not using the computer, my teenage boys filled it with their own video games and Wordfast just disappeared off radar. Perhaps they removed it by mistake.

I have tried to reinstall it, to no avail. It just will not "stick". I can see the icon in the Add-Ins, and when I click it to open the program, the icon disappears. Every time!

I love using Wordfast when translating because it is such a brilliant program, and it is really frustrating to keep going back to the old computer whenever I have a text that requires Wordfast.

This may be an unrelated problem, but whenever I reboot the computer these days, I get this message: Could not load file or assembly 'MOM.Implementation' or one of its dependencies. The system cannot find the file specified.

This has occurred for roughly as long as I have experienced problems with Wordfast. Could the two be related?

Any ideas, anyone?

Kirsti (UKFinn)