I've made my little software widget, http://www.hayseed.net/~emerson/setaffin.html, available to the outside world.
setaffin will 'wrap' any process you specify with a CPU affinity mask such that it will only use CPU 0. This fixes crash problems with a mess of D3D-enabled games, most specifically, Black&White and Deus Ex. If you have a multi-CPU NT-based machine (NT/2000/XP) and have had trouble with 3D games, give this a try.
Please mail me with any good or bad reports you have with this software.... Thanx.
