In oups.com,
randau had this to say:

Isn't there someplace where you can select NOT to have
"Auto-Dial-Up on Demand" when you invoke an application that
does require an Internet connection?

Well, you could set the computer to not dial at all but that defeats the
purpose and doesn't clean up what I suspect is the underlying problem here.
I suspect malware of some type given the description that you've given us.
Maybe a trojan? Maybe spyware?

Download, update, and scan with an anti-virus application. Both AVG and
AntiVir are free for personal use if I recall. I don't know of a specific
anti-trojan scanner that's free.

Download, update, and scan with AdAware and Spybot Search and Destroy. Those
are the two best free ones out there as Microsoft's Anti-Spyware beta
doesn't work on 9x or ME I don't believe.

In both the above cases try your scan in safe mode without networking and
make sure that System Restore has been disabled. After the scan is complete
reboot to regular mode and scan again. If the system comes up clean on the
second scan turn system restore back on and make a new restore point.

With what you've said I'm inclined to make my first guess for the behavior
as it being some sort of malware and that's where I'd begin. And while you
could probably stop the dialing that wouldn't do anything about keeping your
system clean, secure, and stable.

Galen
--

"My mind rebels at stagnation. Give me problems, give me work, give me
the most abstruse cryptogram or the most intricate analysis, and I am
in my own proper atmosphere. I can dispense then with artificial
stimulants. But I abhor the dull routine of existence. I crave for
mental exaltation." -- Sherlock Holmes