Driver install error

Ok, so after tons of trouble installing win xp sp2 with bootcamp, i finally got it to work, just did it about a dozen times and after numerous errors, it finally worked. everything was fine, i was excited. i put in my mac drivers cd , it autoran, and began the install...as soon as the ati x1600 driver went to install, a popup came up saying that it had not passed xcp tests...being an experienced pc / xp user, i knew i could just click ok continue, etc and it would install no problems, however, i couldnt move my mouse, so i figured, ok tab key that also didnt work, everything was frozen, i waited about a half an hour and nothing changed, my computer wasnt frozen, i had a firewall' popup from windows but my keyboard and mouse were frozen. so i did a hard restart (powerkey) and it loaded up again, but the keyboard and mouse still wouldnt work. ive searched the internet adn apparently this problem is fairly common, and the only solution found has been to try and reinstall windows, some ppl as many as 6 or 7 times before it was fixed...im wondering...what exactly is the cause of this problem. o im on a mbp 17''.