Našel jsem k tomu tohle
http://www.techsupportforum.com/forums/f217/solved -diagnostics-policy-service-wont-start-636821.html

a údajně funkční řešení:

Hi, go to start ,search and type:- cmd, right click on returned cmd.exe and select "run as administrator" at the prompt type:-


net localgroup Administrators /add networkservice
press enter then type:
net localgroup Administrators /add localservice
press enter then type:
exit
press enter and restart your computer

Open services and make sure the service is started.