Process Explorer v15.23: This update to Process Explorer adds the ability to view the process token of protected processes, fixes a bug that causes a crash when viewing thread stacks on Windows XP, and fixes a bug that causes a crash when running on Windows PE.
http://blogs.technet.com/b/sysinternals/archive/2012/10/03/new-psping-v1-0-updates-debugview-v4-8-process-explorer-v15-23-sigcheck-v1-81.aspx