Hehehe Vista....
No I know how that feels, it's very annoying

Hmm... what to do...
If you have any other video cards laying around try using them instead of the Nvidia one Vista is using. Like your old comp's perhaps? It seems like (I could be wrong, but) the mod has another way of handling graphics or something. If you could find the file(s) that do that and remove them (if JA+ would even still work) it might work. Look for one called ui.qvm and replace it with the one from the un-modded version.
Random guesses here, don't hold me to any of that, but it's worth a try