A few things are coming to my mind here.
You said you pushed display sliders to the max, which is why I think you had crashes, not because your card is not compatible. I have a non compatible card, my sliders are just about the same as they were in Vue6, instant is 25% to the left, background is about 65% the the right, and it works nicely. OpenGL antialiasing is off.
Now about activation problem, you need to run Vue as admin when you activate it, so if you installed Vue and let the program start from the installation menu, you didn't activate it as administrator.
I think you need to uninstall/reinstall, but before you do thid, you need to delete any remaining Vue file from your machine, they might be inC:Users/yourname/e-on software OR in C:Users/document/e-onsoftware, AND also in C:Users/your name/AppData/Roaming/e-onsoftware, and the reg file you'll find in the windows directory.