When installing Exchange 2013 on a server 2008 R2 in a windows 2012 domain I get an error message saying that the account used to install Exchange should be a member of the Domain Admins security group.  I was logged on as the administrator when I started the install.  The server has all the prerequisite installed.  Any Ideas?

Domain Admins is very different from logging on as a local administrator.  You need to get your domain account added to the security group.  The exchange install requires more than just administrator rights to the computer you are installing it on, as there are domain environment dependencies.