Windows 2012 R2 install fails

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Whilst installing a Windows 2012 R2 virtual machine in Hyper-V, I received the following error message immediately after choosing the edition.

"Windows cannot find the Microsoft Software License Terms.  Make sure the installation sources are valid and restart the machine"


I had built many 2012 R2 servers in my lab previously so wondered what was different here?  The only thing I had changed was the amount of RAM to 512MB as I had a number of virtual machines already running.  When you change the RAM to 1024MB this problem no longer occurs.

I wish Microsoft would do a RAM check and show a message which said "not enough RAM" rather than this cryptic mess.

Cheers
Sam

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