How did u installed your Oracle.If it is through custom u might not have selected the OMS tool for installation.If not try to install the OMS through custom then create a repository.Then u can find OMS server in the control pannel.
thanks for ur reply.
but i created repository also.
while i am conecting to oem.it is giving error.
'u should check that management server is running'.
at that time i checked is it starting or not.
but i didn't find that service.
should i have to create it.