Two things you might want to try running: 1) A virus scanner of some sort, and 2) Ad-Aware, which you can download for free from http://www.lavasoft.de .


Other possibility it that it's Window's auto-dialler thing for when a program asks for something off the internet but you're not connected. Try testing this by disconnecting, then opening a browser and try to browse some web pages, and see if that causes the computer to auto-dial as well. I've never used auto-dial myself, so don't know what the icon would look like.