After I installed Ubuntu 10.04 LTS on my Desktop off my CD, I went ahead and created 3 new Users in the Users and Groups. After those were created, I tried logging off. There, the Screen had the login window, the time/date and the power button. The mouse works, yet cannot click on anything. This happened after logging in for the first time, and booting into Ubuntu.

Any solutions,

EDIT:I re-installed Ubuntu, and the problem persists. Is it that the ISO file I have is corrupt, or that something went wrong while booting.