Windows setup claims the installation source is not accessible. How do I fix this?

Posted by Wil on Super User See other posts from Super User or by Wil
Published on 2010-10-25T08:24:27Z Indexed on 2014/06/09 3:31 UTC
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windows-7

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installation

I'm trying to install Windows 7 Ultimate over my existing Windows 7 Professional. I downloaded the ISO from Microsoft and burned the install disc at the slowest speed possible (x3).

I booted to the DVD, but at the second screen I am already getting an error! That screen I am choosing between "Upgrade" and "Custom". I am trying to choose "Custom" but then I get the error:

Windows installation encountered an unexpected error. Verify that the installation sources are accessible, and restart the installation.

Error code: 0xE0000100

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