Two things
The installation file : run it as administrator and then the same with the actual software .exe file too. That's a windows 7 issue, ok some computers, It doesn't play nice with some softwares and vice versa
Also .. To be extra sure it'll work, I recommend running 3GX software in "compatibility mode" .. Compatible to windows xp service pack 3.. For doing that you'll go right click on the .exe file and go to properties and I think if I remember correctly there is a settings tab on top, regardless , go through the tabs and you'll see compatibility mode there and check that, and select the windows version I said.
That should take care of this
Fly safe!!

have fun!