I'm sure this has already been posted but I couldn't find it so here's my problem. On my taskbar there is a flashing icon of a white question mark in a blue circle and a red circle with a slash through it. Every few minutes a caption manifests that reads, "Critical System Error!, followed by a paragraph of how infected my computer is and so on." When I click on it, it takes me to a website for VirusBurst Anti-Spyware Protection. Now I scaned with Norton and it said that my computer is clean. So my question is how do I get rid of this icon and message?