How to remove or change default operating system?

I'll keep this simple, let me know if you need more detail. I loaned a friend my laptop, Compaq Presario V2000. It had Windows XP Home on it. This dumb @*%26amp; installed a registered copy of Windows Vista in addition to the XP.



Now, since this Vista was already registered, Microsoft has shut down both computers and he gives me my laptop back!!!



How can I remove the Vista, or, change to XP as the default because now, it opens with Vista, and tells me to register it. I can't register it, so my laptop is useless.



Can anyone help me?How to remove or change default operating system?
If you have your XP CD just put that in your CD Rom if you don't have it then you could buy it



Good luck!



Btw don't give your friend a tech item again.. he should be ashamed! lolHow to remove or change default operating system?
Well unfortunately your xp is gone because he upgraded it, so you'll have to perform a fresh install of xp from your cd. Here's a tutorial:

http://www.hollandpcservice.com/forum/shHow to remove or change default operating system?
What I would do is go by a new hard drive and Then install XP fresh on that hard drive



It would be easy and less work.



You would still have to go to the website for HP and get the driversHow to remove or change default operating system?
tell him to buy a new copy of vista and put it on the computer.

Or ask microsoft or hp witch is with compaq do a live chat and ask them.

The contact link is usually located at te bottom of each page



And your friend umm just don't know