Enable distributed COM on this computer

In our Intranet, we have an ERP system based on SQL server. Recently after I update my windows 2000 server system, the ERP system becomes very unstable: the clients often cannot log on into the system. I check the Component services – Properties of My Computer, the “enable distributed COM on this computer” is turned off. I turn it on, and it prompts me to reboot; I reboot the machine, but it is turned off again. I have to turn it on again and reboot, after several times, the system becomes OK. Why after I turn on the “enable distributed COM on this computer”, and reboot, it will turn off automatically by the system? How to keep the option on?