I was prepping a virtual environment within VMWare Workstation 6.5 (EZInstall approach) for Microsoft SharePoint 2010. I encountered the following challenge when booting from a Windows Server 2008 R2 x64 ISO:
"The unattend answer file contains an invalid product key..."
To get rid of this show-stopper I simply disabled the floppy drive connection it had created. It worked like a charm.