It sounds like some program there always wants to stay connected. Perhaps you have you internet options set to automatically dial, or you have set some program for auto-update.
If you have Windows auto-update enabled, it is often set to check for updates every five minutes (and you can't change that setting).
I don't know how that Trojan invasion was dealt with, or whether it coincided with the re-dial problem, but I would recommend that you download Spybot from the link below. After installation, have it check for updates, first, the run a scan. Have it fix everything in
red. .
http://www.safer-networking.org/inde...&page=download
Let us know if this has any impact on the problem.
Good hunting!