RIP Listener; IPRIP; Event 29031

"IPRIP was unable to add a route to the system route table. The data is the
error code."
Vista Ultimate SP1

There are multiple entries in the System event log about every 30 seconds.
In the mean time I just stopped the RIP Listener service and have it's
startup set to manual.

I understand that RIP really isn't needed for most users, but the question
remains as "why" and "how can it be fixed".

Thanks,
Nathan