Logging Service Usage

Is there a way to log service usage in Vista?

Basically I want to set a few of the 'supposedly' unneeded services to manual and then set up a monitor, and a couple of weeks down the line see if any have been started and why.

I can't say for certain about Vista, but in Windows 7 every time a service is started or stopped it records a 7036 event in the System Log.

There will be a lot of such events, but you could (hoping it's the same in Vista) create a custom view of the logs to display just those events then export the data to a text file (Save All Events As...) and search that for the services that interests you.

Ahh, found it. Forgot with event viewer it was already doing the logging, but as I was viewing 'errors' or 'warnings', I couldn't see what I wanted.