uninstalling 98

I finally have my new hard drive formated. I plan on putting 10 gigs towards 98 and the 90 other gig s of space to xp. First though, I have found that my 98 has corrupt files. What I want to do is uninstall 98 and then reinstall 98 on the old drive before I disk copy it into my hard drive. I thought that I did it once before without losing any files or programs.
thanks