My old desktop PC has got windows XP built into it. We recently bought a laptop with windows vista, is there anyway that I can put vista on my desktop, whilst keeping it on my laptop?

I have a desktop pc with Windows Vista and a Laptop with windows 7. How do i connect them both to a wireless home network?

I have uploaded a large amount of photos to my computer and have looked through them using the slide show option on windows media centre (vista). What I want to do is add a soundtrack to these pictures whilst the slide show plays. Can this be done and if so how? If anyone knows some step by step instructions thane this would be great.

My computer is windows vista and every 15 minutes it says not responding when a program like firefox,int.explorer,msn or skype is running. It freezes the whole computer. Vista is so resource hungry and i dont even use that many programs this comp. How can i change to XP?