Errrrm. Don't reinstall yet. You have Gentool but you're not using the C&C:Online launcher. Could you walk me through? You click the shortcut and you get what? Can you post a screenshot of what you're seeing?
I have the cnc launcher installed..... When I click the zh shortcut (without cnc launcher) the game starts and I get that middle bar from gentool (version 7.4, press enter/insert and so on). After a short time the main menu blends in. When I now go on Multiplayer and Online I get this screen:
http://prntscr.com/f8ijxl (image via lightshot)
I'm using the "EA classics: first 10 years" edition (was released some years ago here in Germany) I had to install the no cd fix since windows 10 couldn't start it otherwise but Gentool gives me no error message or something.
Also...I get the exact same "online screen" when I start it through the cnc launcher.