I have some type of virus on my computer that will not allow me to run McAfee that I have through Comcast. It will not allow me to run the one that comes on the Yahoo Toolbar. When I run Windows Defender it claims that there is nothing wrong. This virus is smart...I posted a question on Yahoo Answers but it closes the window when I attempt to retrieve the answers. I tried to buy Norton online and it closed the window. I am at wits end. This virus has frozen up my computer and has made it very hard to surf the net. I will be starting school online in April and need for my computer to be up an running. I would greatly appreciate any help. Thanks in advance!!!