suku50, Se the reply in the thread at the link below. In your case you would checkmark the drive letter in Tweak UI instead of unchecking it.
I have windows xp installed. I have two hard drive attached of 80GB(with the OP system in it and as master ) and 40 GB (as slave), pentium IV, 2.66 GHZ. I had system mechanic installed in my system and due to some problem i had repaired my OS using the installation CD. After boot the system mechanic kept on asking that some *****.exe file is trying to access the system amd whether to accept or deny the request. Due to the repeated annoyance i replied ignore always, but after this my operating system is not showing the 40 GB drive. I tried again by repairing the XP and also by uninstalled the system mechanic but my computer doesnt show my slave 40 GB drive. Can somebody help me by telling me how to get my other drives be shown in my computer without formatting my C drive