You need to edit a file called /etc/fstab.  In that file, there should be a listing of all devices that you have mounted. Let's use an example:
* Red Hat is on a dual boot with Windows on the primary harddrive
Run this command:
$ cat /etc/fstab
It should return something like this:
#/etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>               <dump>  <pass>
/dev/hdb1       /               ext3    errors=remount-ro       0       1
/dev/hdb3       /media          ext3    auto                    0       0
/dev/hdb4       /home           ext3    auto                    0       0
/dev/hdb5       none            swap    sw                      0       0
proc            /proc           proc    defaults                0       0
/dev/fd0        /floppy         auto    user,noauto             0       0
/dev/cdrom      /cdrom          iso9660 ro,user,noauto          0       0
/dev/hda1       /windows/c      vfat    auto                    0       0
/dev/hda5       /windows/g      vfat    auto                    0       0
/dev/hda6       /windows/d      vfat    auto                    0       0
/dev/scd0       /cdwriter       auto    ro,noauto,user,exec     0       0
In this example, I have two physical harddrives (/dev/hda and /dev/hdb), both of which are partitioned. (/dev/hda1 = "C:" on Windows, whereas /dev/hdb1 is the / directory of my Linux drive). I had to manually input the information into /etc/fstab to make it automount upon the initial, and only, boot of Linux, as specified in the <options> column.  You don't really have to worry about the <dump> and <pass> fields for now. What I have will work, for the time being.  
When setting up /etc/fstab, you have to not only declare the file system type (in this case vfat), and its representation in the /dev directory (in this case /dev/hda1), but you must also specify a mount point (in this case /windows/c).  Basically, what this means, is that  you have to make mountable directories where you would like to access your mounted filesystems. In my case, I ran this command after I editied /etc/fstab:
$ mkdir -p /windows/c # and then all other Windos drives
Once everything was delcared, you can run:
$ mount /windows/c
Then run this command:
$ cd /windows/c; ls -la
You should be able to see the entire DOS tree, the directories, files, and permissions.
After that, you can set up "shortcuts" to your Windows drives on your GNOME/KDE/whatever desktop.
Hope that helps  
