o sry i'll do a click by click, i've just been busy and haven't been at my home computer so i didn't have my xp cd with me before.
Steps.
1. place xp cd into cd-rom drive
2. When the blue screen pops up chose "install windows XP "( if it doesn't pop up go into my computer and "right" click on the cd rom drive u r using and chose "autoplay")
now i have to go by memory because i can't try the thing on my computer, it would mess it up.
3. I believe it goes to a screen that askes you if you want to upgrade or install a new windows. You want upgrade. Then you just follow the steps after that. I believe you have to put your product key in soon, but otherwise if pretty much does it for u. When it is completely don't and u are in windows xp u will need to unlock windows. if you have a dialup connection i suggest copying down the numbers so u won't lose them, but they should still be there after you upgrade (never trust what should happen though, u never know with computers) Anyway, you will need to unlock windows with an internet conection, don't worry you have 30 days to do this if you don't want to do it right away, also if you cant get the interent to work you can call microsoft and unlock it by phone.