Hey ladies!
I wrote a somewhat detailed post of howto optimize and solve problems with your Windows PC here (including things like how to find out the physical hardware IRQ lanes on your mainboard to find the best PCI slot):
:: View topic - Diagnose and Optimization of Windows performance
And I just recently wrote howto optimize Bootcamp for optimal Vista performance on (late 2008) Macbook (Pro). I will check XP on Macbook Pro in a few days.
HOWTO: Low DPC latencies (<100 us) on bootcamped Macbooks (Pro)
Feel free to take any informations out of these and do whatever you like with it.