A better idea is to research hacking windows so that it stops putting bits of OS in the pagefile for no reason. There are some naughty versions that come pre-altered, but as fat as I know it can be done after the fact too.
NEVER turn it off althogether.
Make it very small if you must. My XP on a 4GB box had only 100MB of swap. Everything ran brilliantly and the only error I ever got would be when the machine had been sitting idle for hours....."windows doesn't have enough virtual memory". Proof positive that it does actually spend it's spare time idly wasting system resources, otherwise it may have noticed half way through a game don't you think.