Vista - Hide Vista drives from remote XP computer?

Hi,
Thank you for this article. Very useful. (Simple File Sharing - Enable)

My question is somehow the opposite of this. I have set up a network at home using (workgroup) a Windows XP professional and a Vista Home Premium machine (both 32 bit).
I remote desktop to my XP machine from the vista machine and manage it.
I am not sharing any folders on my Vista machine.
I recently noticed that I'm able to see all of my drives on the vista machine in the XP machine, even when I have all the the network discovery, file sharing, public folder sharing on the Vista set to OFF.
I also have Password protced sharing on and have media sharing off.
I have even gone to the firewall setting (on the Vista machine) and made sure that file sharing is off in the firewall exceptions settings.
But I still see all of Vista drives in the XP machine, how can I turn this off on Vista so my XP machine wouldn't be able to see my Vista drives?

Also, after further investigation, I noticed that on the XP machine, the drives on Vista machine, do not show up as shared drives but in fact they show us as network drives. After trying to disconnet the drives on the XP machine (tools> Disconnet Network Drive), I see the following:
\\TSCLIENT\DriveName
And I cannot disconnet!?
So after googling, it seems that TSCLIENT is used for remote access, but I don't want my XP machine (or any other network machine) to see my drives on the Vista machine..is there a way to hide my drives on the Vista machine? Also, is this a security risk, since now XP machine has access to all my drives and files on the Vista machine?
I've had this remote desk connection running for months and didn't see this, so how come now the Vista drives show up on XP, since a Week ago...what could be the cause?
Thank you.