Whether you can do this depend on the material you have. It is easy to REFORMAT the hard drive - this will clear the system. You will then need an operating system to install Do you have such a thing? Tell us more about your computer and the disks that came with it.
Presumably you also have your COA (Certificate of Authenticity) sticker somewhere on the pc, or with the XP disc? The one with your XP licence key on it; that's the string of numbers / letters you'll need to enter during installation. If so then you're good to go! Just print out and follow the instructions on the Eldergeek site on rawprawn's link. That's what I did and it worked a treat.
Backup any documents, pics, music, emails you want to keep. Copy to a usb flash drive, external HDD, or burn to CD / DVD.
Format HDD Install XP Install motherboard drivers Install other drivers (graphics card, sound card, printer etc etc) Install other software (eg MS Office) Copy back documents etc
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