I have tried Fn+F7, that, did not work. All your responses is greatly appreciated. Thank you in advanced.
During the login prompt, try to hit Fn+F7 first and test if your touchpad works, then you may now login.
If you're already logged-in and didn't hit the Fn+F7 button, you're obliged to use a mouse because the touchpad will not work. I hope there's an update on this one soon.