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I'm trying to install the 64bit version of 14.04 on a computer with an AMD Athlon 64 processor. The computer is currently running 64-bit window 7, which I plan to dual boot with Ubuntu. I downloaded the iso image, burned the image to a DVD, and booted from it. The installation process gets to the purple screen with the word Ubuntu in the middle and the flashing dots below the Ubuntu word. I waited for over 1/2 hour and the screen still shows the same image. I noticed the Ubuntu download web page also offers a Mac 64-bit version that says "(AMD)". Do I need to use the MAC version instead of the regular 64-bit version given the fact that my computer has an AMD Athlon 64 CPU?