The question is: how much do you need the task scheduler running (assuming that is the service running it)? If you don't need it, go to the Services panel and stop it (as well as prevent it from starting up).
I believe taskscheduler is used by at least Norton Anti-Virus (for on-access checking and a few other things).
I had it disabled in Windows Xp but I am not in windows atm so I cannot check.
To disable this port from listening (iirc) you need to edit some of the svhost (or was it svchost) entries in the registry.
Use google to search the microsoft site for exact details