Desktop with AMD 64 bit processor. About 1 year old. Two hard drives, Ubuntu 13.04 on one, Windows 8.1 on the other. Burned Ubuntu iso onto a USB stick. When I start the machine, it gives me the options of trying Ubuntu or installing it, etc. I choose to try it, and after a long long wait it comes back with a message that it cannot find any file system.
What should I try?