I have Windows 7 Home Premium 64 bit and just installed Ultima VII.
Black Gate will not run at all.
Serpent Isle plays the opening video then closes.
The graphics configuration utility says the game is not installed.
EDIT I made all the exe files run as administrator and it rins. Haven;t checked the configurator yet.
To use the configuration utility, you HAVE to run the program from the start menu shortcut the GOG installer creates. The shortcut has a few command-line options set that allow it to work properly.