I am installing Exchange 2013 SP1 on a 2012 R2 standard machine in a domain that has a 2010 SP3 Exchange server in it already. A screenshot of the error is attached. It fails every time I try to install and a cursory search online has not helped. I've tried uninstalling and reinstalling and still no change. Has anyone seen this error and been able to resolve it without completely wiping out the server or starting another domain and migrating machines and data over?