If that computer support W7 like you said. I am sure it will support Ubuntu 12.04. So I would probably suggest an upgrade if you can. follow the steps from that link on post#2
With a fresh install you will have to go back and re do all setting and re install the peripheral such as printers and stuff, I personally wouldn't like that.
Good luck to you!
Last edited by TroN-0074; 05-21-2012 at 10:40 PM.