You could boot into single user mode
See here:
http://www.redhat.com/docs/manuals/l...ng-single.html
Then use chkconfig to remove the service: do
#chkconfig --list
when you get into your machine, to see all the services then do
#chkconfig <name-of-service> off
to switch off the service
Dave
P.S. Control-\ can stop some processes.