I have a network of about12 Windows 7 desktops. Out of these 12, two for some reason act very strange, mostly notable in the terrible performance of both VNC and Remote Desktop. On all other computers on the network, both remote access options work great. However on the two problem machines, VNC and Remote Desktop both are extremely slow, the connection drops every few minutes, etc. If you dial the VNC client used to connect the computers down to tight/low bandwidth you can use it a little bit before the connection drops. With regular VNC settings or remote desktop it drops even as the screen is initially loading.
The two problem boxes both happen to be Dell Optiplex 790s. Windows was installed from scratch on each. The fact it is happening on two machines, not just one, and they happen to be the same model indicates to me some sort of the problem with the hardware of those specific models. Otherwise, I have no idea. I have checked the network card and video card drivers via device manager and they seem to be installed properly. The whole thing is a mystery and driving me crazy as I need to get on these machines remotely almost everyday.