First thing, I have an open ticket with McAfee second level support about this problem and they have been looking at it for two weeks without success.
I installed McAfee Endpoint Security Suite 10.1 on two servers. One was a new install 2012 Essentials and other was an existing 2011 SBS. In both cases the installation appears to go successfully but the "MacAfee shield" is not displayed. Once a reboot is done the server will hang at "Applying computer settings" All Active Directory/Domain services are unavailable.
When an attempt to uninstall, a log entry that the uninstall password is incorrect is made.
I never set an uninstall password. Both installations are stand alone (No EPO) and totally default.
Workstation installations are not a problem.