Looking to rename drive letter.

Dear All,

While I'm slowly transitioning over to Vista from XP, until I'm fully use to
it, and all the applications/games work, I'm dual booting, and I'm trying to
have pretty much the same set up, even down to the drive letters...but I've
tried to change the one that is my XP drive, currently D to something like
X, so my D Drive on XP is also the D drive on Vista, but when I try it
informs me it has a pagefile or OS on it, and I can't do it...

Is there a way around this?

Regards
Paul.