On running Ubuntu 12.10 through hard disk installation, the "details" app shows that graphics driver is unknown, as shown in the following image.

But when running an Ubuntu live usb, which contains Ubuntu 13.04,it shows that a driver is present

So, from this I think that I need to install the driver for corresponding graphics card, but I don't know how to.

btw my previous experiences with drivers are not good (when I was using windows xp),so I really need some help.

this is the output of the command

glxinfo | grep render .