What should I do First

I recently bought Windows Vista Home Premium (Update Only Edition because I have XP Home) My question is when I put XP Home on my Macbook should I install the Bootcamp Drivers from the CD and update the Drivers via Software Update before I upgrade Vista or should I upgrade to Vista first then put all the drivers on..... About a week ago I installed XP put the drivers on and updated the drivers then upgraded to vista I had alot of Driver issues on Vista so I i got rid of Windows on my Mac.

So what should I do?