QUOTE (karaddin @ Jul 3 2009, 23.03)

Thanks heaps for all the info, I'm running Vista 64 with 4GB of RAM, although if it improves performance for this I'm not adverse to picking up some more RAM, only got 4 cos I've never used it all before. Will try that fix later and see how it goes, apart from the performance the only downside I can see to TR vs BtS is the inferior AI.

That should be fine. Try the fix I linked to, the one that I used, (should be the first link) and you shouldn't have any problems. I was pleasantly surprised by how well it fixed the problem. First time I've ever seen Vista be preferable to XP too.