Well, just get to downloading all of the drivers that you need.. Remember, ALL of the data on the computer will be erased if you reformat. Backup EVERYTHING that you want. Also, i dont think i ever asked, but is your hard drive connected via SATA? It will be SO much easier to install XP if you are just using ye old IDE cables. (The fat grey ones, sometimes black though). Anywho, once you have everything set, just put the XP CD in the drive (make sure your CD-ROM is in first order to boot from) and it'll tell you to press a key to boot from CD or something.. Upon entering the CD menu, you will want to format your disk, then install XP using NTFS.. Once you install XP, you can then try installing the drivers for what you can. Anyway, have fun.