advice needed, please

I have just install visa onto my old computer and I am thinking of putting
it on my new computer.
I have xp pro on my C: drive and I was thinking of putting vista on my D:
drive.
If when the beta period runs out, or if it (vista) does not like my
hardware/ software and is unusable could I not just boot into xp delete all
the vista files on the D: drive and edit the boot.ini file?

If vista is installed on the D: drive what gets added to the C: drive?

Any help and advice would be gratefully appreciated.

NIK

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