Mouse clicks in Cubase 5 don't respond

I did a format to my laptop, 1 month ago and until now, I can’t work on Cubase 5, because the mouse clicks do not respond. I hit play, no result, right click to create audio track, nothing. I tried using another mouse, working on another program of the same kind (Nuendo), uninstallind and re-installing the program, still the problem won’t retreat. My operating system is Windows 7 Home Prenium SP1 64-bit.
If anyone has any suggestions, I would be gratefull. Thanks in advance.