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I'm trying to upgrade from Windows 7 to Windows 8, so I downloaded the ISO and burned it to a DVD.

However, when I try to run it nothing happens. I get the dialog asking me if I want to allow the program to run but nothing happens.

The disk works if I boot from CD/DVD. However, when asked if I want to do a clean install or an upgrade it tells me that I have to boot to windows and run the DVD.

Any ideas?

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Do you have UAC turned on? – imtheman Sep 16 '12 at 4:53
    
I turned it off. – devlife Sep 17 '12 at 13:53
    
Have you checked the download checksum? (I had that problem once; it even got 78% through install before it would fail.) Did you verify the ISO burnt correctly on the DVD? – Mufasa Oct 28 '12 at 7:06
  • Check the checksum of the ISO that you originally downloaded and burnt to DVD.

  • If it checks out, try checking the checksum of the DVD.

  • If that's correct, when you run the 8 install program from 7, make sure to right-click the setup program and hit "Run as Administrator".

It is also a good idea to look in Task Manager/Process Explorer or another monitor. Do you see the setup process appearing and disappearing? Does it stay on the screen? Never appear? This can help diagnose problems.

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