This is quite easy. In order to start or stop a service in Windows 2003:
=> Click on Start
=> Select Admin Tools
=> Select Services

Now you can view the service names, description, status etc.

Task: To start or stop service

=> Select service name
=> Right click on a service name
=> Select Properties.
=> Now select Start or stop per your requirements.

Task: Make sure service start on Window server boot

To start a service when windows server boots, select service name and set type to automatic.

The Windows Event viewer error logs always contain more information about why service failed to start.