Can anyone tell me if it's possible to have 2 partitions on my computer with one of them is Xp and other vista

Question

My hard drive is 100 gigabytes and i have 65 gigabytes left,

Answer 1

When Vista comes out and you get a copy and try to install it on top of XP it should ask you if you want to do a normal upgrade or a dual boot. Choose Dual Boot and it should walk you through the rest of the steps.