FS 2004 - Remove FS 2002,FS 2000?

I recently installed FS 2004, and it seems to work fine.

I also have files from FS 2002 and FS2000 stored in my hard drive. - Are
these three FS programs (2000, 2002, 2004) each independent of the
others, and is it safe, and recommended, to delete the files from
earlier versions after installing 2004? Or, should I delete them all
and reinstall 2004?

Thanks,
Jim