I have tried my old 11.04 disc, and I also downloaded both 64bit and 32bit versions of 13.04. I can make the disc and I can get into the installer after rebooting, but when I click to install it, it sits there for hours before coming back with an error. I can't remember the error but it gave me the option to try again or cancel so I said eff it and quit. I really want 13.04 64bit, but its giving me trouble. Also, I noticed when I "try" Ubuntu from the disc, my USB DVD drive does not show up until I unplug it and plug it back in, but still does not install. WTF?!