[Smithy]

So anyway, some of you may of seen in my previous thread about the San Andreas issue I had with my iMac while trying to run it on Windows via. Bootcamp. I've had a ton of trouble with my iMac wifi so decided to re-install Lion, and since doing so I've purchased the GTA collection from Steam. I installed San Andreas, and have it working on high settings with somewhat no trouble whatsoever, however when I was playing it on my Windows side it had a ton of lag while it was being played.

I've tried everything known to man to fix this, what other possible reasons are there for my Windows GTA being dead but Lion perfect?