One program you can use to completely wipe your drive
free of errors is Nuke boot disk. Once you perform this wipe your disk
should be completely clean and you can go ahead with the windows xp clean
install.
To perform the windows xp clean install you will need
your windows disk or your boot disk that came with your computer.
If you are not sure what to do here, you can call the
manufacturer of your computer and they will walk you through a clean install
provided your computer is still under warranty.
If you have a windows disk, just go and use that. You
will need to go into the computer bios and set the cd rom to boot fist so
the computer will boot the windows cd.
Once you do this you can restart the computer and
perform the windows xp clean install.
Follow the instructions on the screen and make sure you
format the drive. Choose the full reformat option to allow the drive to be
whipped clean once again.
After this just allow the windows disk to perform the
windows xp clean install and follow any instructions on the screen.
You will need to choose things like computer name,
networking options and so on.
After this is done all you need to do is reactivate
windows and you have performed a windows xp clean install.