Yeah, you have to use the mount command. Do a "man mount" for details. You have to basically mount your windows filesystem to a particular directory. I do mine like "mount /dev/hda2 /root/c" where /dev/hda2 is the windows partition and /root/c is the mount point.
edit: if that gives you an error, try doing "mount -t vfat ...." I believe that's what it is, the man documentation should give you more details.