Dual booting vista and xp vista already installed.

how do i go about doing this and i am using a copy of xp that was previously on another computer but that computer is now dead and dissassembled will windows xp activate. If its not a good idea to dual boot them what is a safe ram configuaration for 1gb ram dual core on virtual pc.
 
OR.......put another hdd in and install xp on that.
That's what i've done. At startup i hit f11 and choose which hdd to boot from, but by default it would boot into vista.
Its a lot cleaner to do it this way too.
As regards xp activation then of course it will need to be re-activated if it was installed on a different pc with different hardware. If its oem then you're breaking the EULA you naughty naughty user!
Also, what do you mean by safe ram configuration?
 
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