problem 1: i would suggest that you let yum get the files from the net, i understand that it's irritating to download the same packages again, but theres the posability that the packages have been updated meanwhile. that said, what you need to do is to set up the files on your dvd as a repository, i cant remember how to do that though
other solution: find the directory on the dvd and install the packages you want.
problem 2: first, fedora 4 mounted stuff under /media insted af /mnt. try there, if nothing's there, your indoze-drive is probably not mounted per default. in that case, what partition is windoze on? lets say it's on /dev/hdb1. then you need to create a mountpoint, if you haven't got one, its just a dir somewhere, run the command `mkdir /media/windoze` as root, then run (again as root) `mount /dev/hdb1 /media/windoze`