Start up Service failure in Performance test

I ran a Diagnostic test from the Control Panel for my system and came up with an "Error saying A Service is reported as having an unexpected error code." Further down in the report it showed a Failure for System Service Checks. It said Abnormal Terminated Service Check-- Failed. It does not call out which Service failed and I checked every service per a listing of Windows 7 default startup settings of Started Services and they all checked good. How can I locate which Service is the problem? I even download a program called Tweaking.com-Set Windows Services to Default Startup.exe and nothing changed. The Error still exists. Anyone have any ideas how to correct this error? Thanks

Since the failure does not spell out which Service has failed, how will the Event log help me if I can't relate any Errors to the Failed Service?

Thanks Kaktussoft for your responses. This will be a time consuming job. There are so many repetitive errors and no real way of finding out what is causing them or how to get rid of them. I will take them one by one and take my time in figuring out how to resolve or remove them. I will close this post for now and maybe later in the future post any results here. Again, Kaktussoft, thanks for your time.