This works for SWBF2.. it will prolly work for SWBF1 too. Are you running dual core? You may have to turn one off and run in "affinity".
Here's the
TweakGuide. It gets into the procedure for shutting off one of the cores, as well as a few other issues for CTD. Like I said.. SWBF1 is very similar to SWBF2 so it may work.