Can'tload ubuntu 12.04 via usb past count down help!

view full story

http://askubuntu.com – im new to ubuntu, i just had a installtion of windows 7 and windows 8 installed but they both crashed just today :(, so now i was wondering if i could just forget about windows and install ubuntu, thing is i don't have dvd or cd, so im tryi8ng to install with a usb using the UNetbootin programand evan the universal usb loader? [or something like that] any ways when i made the bootable usb using those programs, i tryed to boot off the usb, which it dose, but it freezes at "autimatic boot in 1 second" mark and or when i press a button on my keyboard , after the count down is done the little com (HowTos)