No, I do not! Windows Firewall is off, and I have no other form of security software running except Avira AntiVir, which I have also tried disabling.
There is only a dumb Netgear switch between the pc and the NAS, and I can access the fileshares on the NAS, I can ping it, I can access the web interface - the only programs that CAN'T find it is those downloaded from the Buffalo website...
I even tried doing all the same from another pc - still cant find it... :-(