I agree with QKO! But make sure you download it BEFORE you have a problem, because most times, the virus will prevent you from getting the download. I've you've already got the virus, and you have two computers, you can download the program on the uninfected PC and use a thumb drive to transfer the needed files over to the infected PC. I did this for somebody this past weekend and have the link at home that gives all the information. Send me a message if I can help you further.