I bought a laptop with windows vista on it but i wanted to changed it to windows xp. What i did was that i format the whole hard drive and reinstalled windows 98 and then i try to upgraded it to windows xp but it didn't let me do it. At first it was installing but when it restarted a massage appear. It said that the computer had to shut down so no damage would occur to the hard drive. You got any suggestions pf how to reinstall the operating system back in.