Privoxy won't start with Tor/Vidalia. Port problem

Hi!

I am on Windows 7 with the Tor/Vidalia proxy package. After downloading Privoxy 3.0.17 and installing the program, I get the following message when I try to start it:
"Fatal error: can’t bind Privoxy to 127.0.0.1: 8118. There may be another Privoxy or some other proxy running on port 8118".

Most assuredly, I have never installed Privoxy before and I don't know which other proxies may be running on Port 8118.
Aside from Tor/Vidalia, the only other proxy I am running alternatively with Tor for anonymity is Jap-JonDo.

It is also confusing that a host of web sites mention a Vidalia bundle containing Privoxy, but none of the bundles actually contains it. They all have Polypo instead. I hear that Privoxy is recommended, but how do I get it running?

Thank you

Ittiandro