So you should write down how your hard disk is partitoned? (use fdisk or pratiton magic, etc..) your notes should be something like:
C: primary1 hda1
D: logical1 hda5
E: logical2 hda6
F: primary2 hda2
...
Are you ready? Logon as a root, create the folowing directories:
$mkdir /mnt/win_c
$mkdir /mnt/win_d
...
those are the mount pointes (the directories where you would see your beloved windows partitions ;)
Now, mounting:
$mount -t auto /dev/hda1 /mnt/win_c
...
and the general formula: (fs_type=file system type: vfat, etx2,..)
$monut -t fs_type device_file mount_point
Mm.. but should i do it everytime? No! You can attach this to the filesystem table "/etc/fstab", this will cause the mount to be done automatically at every boot.
As a root, edit the "/etc/fstab", and append: (don't pay great intention to the number of spaces)
/dev/hda1 /mnt/win_c auto auto,owner 0 0
..
Now, save and reboot, you will find your favourite windows partitions on /mnt floder!