Routing and Remote Access Error 8007042c

I am using a Microsoft windows small business server 2003 edition in my office.
I have to setup Routing and Remote Access for VP and routing. Upon implementation, the RRAS is not working and generating the following error.

Routing and Remote Access
Routing and Remote Access cannot be started because of the following error. Please see event log for more information:
The dependency service or group failed to start.
(8007042c)
I tried installation many time but the same error appears each time.
I checked and fulfill all the requirements for installation of Routing and Remove access but I am unable to figure out the actual problem that is preventing RRAS to start.
Can any one able to show me the steps to make this thing working.
Anticipatory thanks for the help.
