well they might not have to change a thing. winxp is an NT based system so almost all NT programs work on it. I'm not sure if vista is an NT based system or like winxp has some backwards compatibility. Eithier way their site claims alot of old games will still work on vista so most likely pcsx2 will.
__________________
Q6600 Core 2 Quad || Soundblaster X-Fi Extreme HD || e-VGA 8800GTX || 4096mb 4-4-4-12-2T Dual-Channel RAM || MSI P6N Diamond || 2x 320GB Hardrive || 5.1 Speakers || Remote control || 8x USB 2.0 || DVD/CD ±RW Drive || 1x IEEE1394