Possibly some bot has sneaked into your system and sitting in your hard drive which is sending msges to different servers. Best you can do now is uninstall any additional antivirus. Use Firefox browser instead of IE. Install "Ghostery" firefox addon. It successfully detects and prevents any thirdparty software installation and removes it. Finally configure your browser so that cookies and history are deleted automatically at exit. Preferably use private browsing mode feature of Firefox (excellent feature) to browse in a sandbox environment. If you are using Norton no need to use any other antivirus else Avast is one of the best free antivirus and to couple it with any spyware, use SuperAntiSpyware (free again) which will give you more or less the same security as Norton. Run your antispyware in thorough mode.
Play safe otherwise you could be a victim of identity theft, phishing, malicious software installation etc etc.