changing back to win2000

>-----Original Message-----
>i have xp pro on some of my machines now. i have a dos
>program that for whatever reason is having trouble
running
>on the computers with xp. there is no trouble on the
win
>2000 machines.
>
>I gues my question is can i change to win 2000 without
>having to format the drive. I really dont want to
reload
>all the other programs, etc...
>
>thanks


partition youre hard drive and install 2000 there
>.
>