hi i downloaded vista and i want to install it but i dont want to risk
skrewing up my computer in the process.

i was thinking about installing it on a new partition so: 1) i dont delete
and regret it for some reason later and 2) i can still access my old
documents and files from xp.

can it work if i do that? and if i decide to delete that partition will it
mess up m computer?

also i do not have a key for vista yet and windows have not been recruiting
people into its customer preview program so what do I do?

and lastly, if i install the "ultimate" version but later but another
version, will i have to reinstall it?

thanks for youe help!