failed to install ubuntu 12.04 with usb stick

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http://askubuntu.com – I am using ubuntu 10. I downloaded the iso file of ubuntu 12.04 desktop version, then burnt it into my USB stick(8GB), and everything seemed ok. Now I restarted the notebook, and managed to get to the Ubuntu Desktop, but only after waiting for a good amount of time. After doing so, I proceed to clicking on the button "install Ubuntu", but it seems like it fails to respond properly, and doesn't initiate the Ubuntu installation procedure. I have tried to do so several times, but the button's functionality just doesn't seem to work. What could I possibly do to be able to complete the installa (HowTos)