Follow along with the video below to see how to install our site as a web app on your home screen.
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Stick in the Vista x64 DVD and boot off it, click Next at the first screen, on the next one choose the option at the bottom to Repair your computer. Find the installation you're interested in (I know you'll see the x86 and the x64 editions so choose the x64 edition at that point) and then the next step will be the Startup Repair. Let it finish out then reboot, afterward you should get the boot menu back and both OSes should be selectable.