disabling Reliability access component agent RAC

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A labs exercise requires me to disable the RAC agent and re-enable. It says to do this through task scheduler. I can't see how this is done, can anyone advise how to do this? It sounds more like a job for the services snap-in than for task scheduler. Thanks, Adam.

ps this is in Vista, and I am studying for the 70-621 upgrading your MCDST to Vista exam. Seems like most relevant forum category but I may be wrong.