There are some tools and procedures that can tell with 99.44 percent accuracy whether your computer has a virus. Here are the actions to take: 1. Find out whether your computer has antivirus software: Check for any Anti-virus software installed on your computer. To do this just Click Start>control Panel>Security Center. 2. Find out whether your antivirus software is up to date: You can always know whether your anti virus is up to date because most of the antivirus gives