Vista issues on Zakum

I zak on vista on two different laptops and they actually run a bit differently from each other, lol. For one, I am generally okay to play in window mode and change the graphics setting sometime while I am in the altar (note that I said change and you don't necessarily have to lower it, just change it). On the other laptop I keep it in full-screen mode and change the graphics settings more regularly (i.e. once sometime during arms, and once for each body) as well as alt-tabbing out and right back in (to be safe I do this after arms and each body). It's annoying, but it does the trick.