Something here may help.
https://support.microsoft.com/en-us/help/834484/you-receive-an-error-1603-a-fatal-error-occurred-during-installation
Server 2008 R2 is not currently supported here on QnA. They're actively answering questions in general forums here.
https://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=winservergen
--please don't forget to Accept as answer if the reply is helpful--
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows Server] Datacenter Management
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