I performed a clean install from an Ubuntu 14.04 iso disk. When I login I get a blank desktop with only the Ubuntu 14.04 logo showing in the lower left-hand corner of the screen. Nothing comes up on the screen when I right-click my mouse. I have to power off my HP PC in order to try to reboot the computer.

I have tried numerous suggestions from other threads with the same issue. I am fairly new to Ubuntu and Linux.