I have done that. What I have is one box, one graphics card, one motherboard, two hard drives. One has xp, one has vista. I see the drivers are different, however at a earlier time one set of drivers ran on both os's. They went south and now I have this problem of good graphics only on the os that has the proper driver.....
I was testing which os was the best for gaming at the time and like some of both. And yes my next box will be windows 7- 64 bit. Was wondering if anyone knows a work around.......
Hope that clarifies my prob........