help removing old windows set up

[Guest]

I have just bought a second hand computer which had an illegal copy of
windows xp home on it along with a illegal copy of windows xp pro.I have
bought myself and new windows xp disk but my question is how do i remove
then from my hard drives (yes theres one of each of the hard drives) I have
made a dos disk and started up in dos mode but i cant seem to change the
drive from A drive to C or D drive which are the two hard drives.It keeps
coming up a invalid drive.what am i doing wrong?

 

[GregM]

Reboot with the windows CD, remove all partitions, re-create partitions,
install legal windows xp...TaDa!

 

[Rock]

I have just bought a second hand computer which had an illegal copy of
windows xp home on it along with a illegal copy of windows xp pro.I have
bought myself and new windows xp disk but my question is how do i remove
then from my hard drives (yes theres one of each of the hard drives) I have
made a dos disk and started up in dos mode but i cant seem to change the
drive from A drive to C or D drive which are the two hard drives.It keeps
coming up a invalid drive.what am i doing wrong?

Dos mode can't see NTFS partitions. You don't need that. The
installation CD has all the tools needed to delete the old partitions
and install XP. See this link:

http://michaelstevenstech.com/cleanxpinstall.html