WmBrokermon service deleted

Hi all,
I installed webmethods 6.5 and it works fine, but suddenly my wmbrokermon.exe service got deleted and borker server not starting at all,i have checked in contol panel–>Administrative toool–> services but i didnt find the broker monitor service.

   so please tell me is there any process to start the broker server

Thanks in advance,

recently i installed webmethods 6.o in my pc but i am unable to get wmbrokeradmin package.please tell me,where can i download this package?
waiting for ur replies