How to keep regular shares and add protected drive shares.

i just got a laptop that i want to be able to access all 4 hard drives on my desktop computer from while still allowing my normal shared folders to be available. i want the the drives on the desktop to be mapped on the laptop and then the desktop be able to map drives from the laptop. but then of course, i don't want the root of every drive available to any users that plug into the network or that i plug into their network (such as at a lan party).

so this would require two levels of permission. i first tried to use ntfs permission instead of "simple file sharing", but then guests can't access the shares listing when going to computer's name (\\computername). then i tried using "simple file sharing" and mapping to the administrative shares (C$, D$, etc.). that doesn't work. it won't ask for the password to access while in simple file sharing. now i'm stuck. i hope there's some trick here i'm missing, probably with the ntfs permissions.

both systems are xp pro and on the same workgroup. there is no firewall. the desktop is a gateway for the laptop to the internet, but that probably doesn't matter.