Re: installing 2 operating systems on 2 hard drives on same computer
Normally you would install XP first but here is a tutorial that shows how to do it with Vista installed first.
Obviously just ignore the resizing part as you're using a seperate HDD
Link to Tutorial
Some other Google results
E8600@ 4.25GHz, 1.325V | Thermalright Ultra 120 eXtreme + Scythe Slipstream 120 | Asus Rampage Extreme| 4GB Corsair 2000MHz 8-8-8-24 @ 1600 6-7-6-24| ASUS 9800GTX| Pioneer 18X SATA DVD-RW | 320GB + 500GB WD SATAII | Antec True Power Trio 650W | Thermaltake Sonata | Vista Ultimate x64 SP2/Win7 Ultimate