Need to re-install WinXP

I want to format my drive, and do a totally clean re-install of XP, but don’t seem to be able to. I’m the Administrator on my home PC, running WinXp, with 512MgRAM, on an AMD Duron Processor at 1.2gHz. I have a 20gig and a 40gig hard drive. The 20 being the system drive, and the 40 being brand new (formatted to NTFS). I want to install XP on the 40, and make that the system drive, keeping the 20 as a back up drive. ANY help would be GREATLY appreciated.
Also, if Donovan Marsden is out there, could you PLEASE contact me? I’ve lost your e-mail address again!!!