SCCM 2012 Failed to register bgbserverchannel.dll

Update 06/05/14.
Still Check the Server version see if it is Enterprise.

At some stage you will find the the critical status of your roles, and which lead you to check logs of Bgbsetup.log, then you find the error message like this:
CTool::InstallManagedAssembly: Failed to register C:\Program Files\Microsoft Configuration Manager\bin\x64\microsoft.configurationmanager.bgbserverchannel.dll with .Net Fx 4.0

Here is the workaround for this one:
Go to  <C:\windows\Microsoft.NET\Framework64\v4.0.30319>

Make a backup copy of these files
InstallUtil.exe.config
RegSvcs.exe.config

Edit the original files by adding the following under the configuration node:
< runtime>    
    <loadFromRemoteSources enabled="true"/>
< /runtime>
NOTE: If you are not allowed to do so due to rights, right click on the file, property, change the ownership to domain admins. Then you can edit them.
Then go to C:\windows\Microsoft.NET\Framework\v4.0.30319
do the above steps again.
Then re-install the role, and look at the Bgbsetup.log again, you should be able to see it is installed successfully.
REF:
http://www.windows-noob.com/forums/index.php?/topic/7401-sms-notification-server-failed-critical-sccm-sp1-sql-2012-sp1/