Cannot connect the phone book... error 756.

XP Professional, Media Center Edition.
Every time I boot my pc I get this message: 'Cannot connect the phone book entry, Error 756: This connection is already being dialled'. This has been happening for the last month and I cannot relate the start to anything I have done. The error message is on top of the dial-up window. It is easy to close both of them and there is no further issue, but I would like to find out what is causing it and stop it. I do not have a phone book. Does anyone know what is causing this?
Thanks, Soloist.

 

Steve, I have only 7 items ticked in msconfig, I know them all, none are a phone book.
Thanks anyway.
Soloist.

 

Did you try using Windows' "System Restore" to roll Windows back to a previous state when your computer was functioning correctly?

System Restore helps you restore your computer's system files to an earlier point in time. It's a way to undo system changes to your computer without affecting your personal files, such as e-mail, documents, or photos.

 

PeteC, thanks for your reply, I followed your suggestion but had already tried all of those possible causes, without success.

 

SpywareDr, thanks for your reply. My System Restore is unreliable and does not work most of the time. It has worked on the same day a couple of times when I was testing it but does not work on restoring from weeks or months ago. I have learned to do without it because I have no idea why it doesn't work, that's a separate issue.