Hi, when you get to the "try Ubuntu" screen what happens? Does the keyboard move the option or does it literally do nothing? A bit more info on the fault would be great.
Ubuntu itself, well it's perfect if you just browse the web, I'm not a fan of Firefox so I usually install chrome. In regards to installing software it's a bit more complex. If you use "things" like Skype, FTP, xbmc, etc then you may have a few problems installing software as it's not straight forward like on windows with an exe file.
Also, I would recommend using a usb drive rather than discs, especially if I running live version.