clean install

My wife has me 2000 on her pc and I have win/98 on mine. She has programs that will only operate on win/98 so she has to download on my pc and then copy to hers. I on the hand really like the me 2000 but can’t install it on mine because one of us has to have it for her programs. solution, I need to clean install on both ps’s and install the win/98 on hers and the me 2000 on mine. Can someone please help? you helped me with my last question and I thank you very much. Phil