Installing XP on an old system is a bad idea for many reasons. If you've gone that long without buying new hardware, now is the time to buy new hardware. Hewlett Packard makes some very good, cheap systems which are perfect for Poser/3d AND gaming. Look up a320n, which is what I have, only difference is that I added an ATI Radeon 9800 Pro. Runs $600 or less, $850 if you add in the Radeon.