Dowload TCPview and Process Explorer. Use TCPview to see what process is using the port. Note the pid (process id, next to the .exe). Open Process Explorer, look for the pid, and it will give you specific details about the what is going on at that port.

This is a much better way to get a handle on it. You can block ports till your blue in the face, but until you know what process/es is/are using them you won't know if its legit. Chances are they are system processes.

See this very good tutorial by sec_ware to figure out what system processes you can do without and how to turn them off.