I am using Vista Home Premium, and recently I have started receiving pop-up security alerts pertaining to an expired certificate (*.sightspeed.com). Although I respond by checking off that I do not wish to install the certificate, the warning message continues to pop up every few minutes. I can't get rid of it! The warning occurs after booting up, and before I activate any software. I have no idea what this certificate does, but how do I get rid of (deactivate) the warning message?