My daughters computer crashed out big time. it will do NOTHING. itll turn on, and sort of load, but thats about it. Since I am disabled and unable to rush out and spend $500-$1000 on a new one for her, i thought about just replacing the hard drive. i have XP to install on this new disk. is there anything weird i need to keep my eyes open for when doing this? And is it "ok" to take one out and put a new one in?