I installed Ubuntu 12.10 on my desktop, and it boot up ok, but I was having some artifacts, so I read somewhere that I needed nvidia drivers, I downloaded them, along with compiz (I enjoy the nice effects), but after that, when I rebooted the computer, the resolution was all messes up, and now I can't access anything because there is no launcher! I inserted Ubuntu CD, booted from the CD, the resolution was fine and eerything was OK, so I repaired the installation, but after restarting the computer it was all messed up again! Please help me! I'm running Ubuntu 12.10 on a Core i7 and a GTX 460 + GTX 280!
How Ubuntu looks as soon as I turn on my computer on: 
