you can use Fport available on www.foundstone.com its a port mapping utility i keep it in system32 so that i can use it as soon as i see a suspicious connection
It appears the original poster is using Windows? Just to add some Linux information here (for others who would like to know,) in RH9, this can be done by accessing the services file in the /etc directory.
cat /etc/services
vi /etc/services
Placing a semi-colon at the beginning of the line prevents that service from starting. You can then KILL the process or simply reboot.