Check the below link
http://social.technet.microsoft.com/Forums/en-US/e5d6f727-e952-4526-a381-33107fe159e6/dpm-2012-end-user-recovery-extending-ad-schema-tool-crashes-with-error?forum=dataprotectionmanager
Go to the bottom of the link for the solution. Adding those values in the registry fixed the problem in my environment.