Repair Install of XPThis is if you want to retain your data on that drive.
Make sure to read the instructions fully paying special attention to the Warnings...
Done properly all your data and programs will be retained.
Done improperly your data and apps will be gone but you will wind up with a clean install of XP.
I also suggest printing out a copy for reference
The CD key is all you will need to register with MS.
Service packs do not need registration.
As far as drivers here's a list of things that need drivers to run:
MBoard
Video chip or card
Sound chip or card
Network chip or card
Printers
Basically any device that runs off the computer uses drivers.
Hard drives do not need drivers unless they are SATA drives...these are installed very early on in the XP install.
CD/DVD drives do not require drivers.
You may want to get some assistance from a friend who has experience building PC's for this project if it's your first time...this can save alot of grief.
Good Luck and keep us posted.
P.S.
The other option you have would be to hook your hard drive up to a working machine as a slave drive to copy/burn your important data...
Instructions HereYou can then just install the components and do a
Clean Install of XP.