I follow the instructions, "How to create a bootable USB stick on Windows". I have downloaded pendrivelinux.com. I select the distribution I wish to put on to my USB, which is ubuntu. Step two, "Browse to your ubuntu desktop.iso-->". I have already opened "Do you want to open or save ubuntu-12.04.3-desktop-amd64.iso(708MB) from mirrorsfwankie.com". When I browse from pendrive USB installer, nothing comes up; a temporary file location is shown in the address bar. Then I go to computer, and there I find "HD DVD-ROM Drive (F): Install Ubuntu" I just do not know what to do from here. I would appreciate any help with this. Thank you.
Ok, the next step would be to (back up your data) and then boot from the USB thumb drive to try/install Ubuntu. Reboot, and your PC should do this automatically.