When I first got my computer I installed Windows XP home on it, but then my brother-in-law upgraded it to XP Pro. I have noticed lately that there a few programmes missing from this, that require me to install the disc to get them back on to my computer. But unfortunately this disc is no longer available. I would like to re-install my XP home, as I know this is OK and I still have all the discs for doing this. But I am not exactly sure how to go about this. I am new to computing and dont want to do more damage than good. Do I just turn on the computer then put the start-up disc in, or is it more complex than that? I would appreciate any help that I can get. And, no, I cant go and ask my brother-in-law, as he is not there any more.