hello there, i baught a used pc which had a windows xp os on it. lately i started getting messages that the os is not legal and it's pretty annoying. since i have a genuine windows xp at home (from my old pc) i want to install it instead of the existing one. this arroused a few questions which i hope you will help me with: 1. since i don't want to format the hard disc is it possible to install without doing so? 2. if it is possible, will it delete all my programs and other personal data/settings (such as favorites, email on outlook express etc.)? 3. how can i find out what drivers i will need in order to install them after i'm done and where can i get them? 4. is there anything else i should think of before doing this that i haven't mentioned?