Q And A

Q I have a problem I hope you can help me with. My son downloaded a program and allowed a Trojan, Vundo, to get into our laptop. You know what it does: slows the computer to a halt, lots of pop-ups. We have Norton Anti Virus and Spyware Doctor, which we run to clear it. However, Vundo keeps returning. I suspect it is embedded in a program on the computer, perhaps the one my son downloaded. Do you know of a way to remove it altogether?