Remote Desktop can not connect to single client

Hi All,
I know enough to be dangerous.  I did search for the issue, can't find the solution.
Server SBS 2008, Windows 7 Pro, remote desktop connection not working for individual machine, works for others. I can ping the machine.
Was able to remote into the server from home, and from the server opened new window and attempted to remote to unhappy client machine - no joy - i get the error ""VBScript Remote Desktop Disconnected - The computer that you are trying to connect to cannot be contacted.  Verify that it is turned in, is awake, and is connected to the network."
Yeah, it's on, in fact, i'm typing on it!  
It had PREVIOUSLY worked, and I've experienced issues like this before, with the solution being a reformat - something I'd like to avoid.  I'm guessing it's a microsoft update that affected settings somewhere, or else an app I've added.
Remote Desktop is enabled (technically, greyed under enabled).    I've fooled around with the registry, with 0 and 1 for fenytsconnections (the default had been 1, i changed to 0 and rebooted, yet ironically, a notebook which works fine under my credentials had the settings as 1 - and in fact, it warned me (in rdp) to enable windows firewalll to allow rdp!!!!!) - i've since disabled windows firewall entirely (and vipre's firewall) - i'm behind a sonicwall appliance anyway - but even with the vipre firewall i could remote into the other clients.
i'm an admin - both doman and local machine.
i've tried being more broad with the group policies (a place i'm not that comfortable mucking around in)
i've seen some VBscripts floating around - i don't even know how to run (i tried making them batch files - that didn't work)
any help appreciated - but almost as much, why just one machine?  thanks so much!