|If you don't want XP, start over again and reformat C and D, installing Vista on C.|
Although I have no idea why you'd want to switch...with all the problems Vista has, but that's up to you.
Just make sure you have all the drivers for Vista before getting rid of XP.
"So won’t you give this man his wings
What a shame
To have to beg you to see
We’re not all the same
What a shame" - Shinedown