You are putting a space between the cd and /mnt, right?
Should be able to do this in user mode or root, try root though, and should be able to do it in terminal or console. Also to make sure waht hda your Windows partition is on, check your /etc/lilo.conf file, it should tell you where it is located on.
Its not giving you an error after you type the command to mount it is it? this is what it should look like in your terminal or console or close to it.
(root@localhost /)# mount -t msdos /dev/hda1 /mnt
(root@localhost /)# cd /mnt
(root@localhost /mnt)# ls
After typing the ls command, you should be able to see all your windows files that would be sitting on C:\ if you were in Windows.
Let me know, this should work for you.