Ubuntu 12.10 not installing via USB stick

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http://askubuntu.com – I have a Dell Inspiron 15R (N5010) and I downloaded Ubuntu 12.10 onto a 4 GB memory stick. Nothing comes up about installation. The only thing that comes up is Install Ubuntu (F:) in AutoPlay. I open the view files and click the wubi.exe file and the Ubuntu Menu comes up. I then click Demo and Full Installation. Then i click Reboot Now. It reboots but nothing happens. I tried pressing the Fn and F12 keys and nothing happens either. I'm not quite sure what to do now.. Any help would be much appreciated. Thank You. (HowTos)