I ran it anyway and it seems to have worked this time. Put it down to 'operator error'

Thanks very much for sticking at this and I hope that thread will be useful for anyone else who has to uninstall vbet for some reason.

Tip to anyone uninstalling: DON'T do what I did and just uninstall as you would with a normal vbulletin mod. Definitely ask the guys here at vbet BEFORE you uninstall. It'll save you a lot of headaches.