Sometimes we use trial version of an Antivirus and when it expires, we just let it rot in the taskbar for a while (just in case) and do not uninstall. But we do not know whether it is working or not. In another case Antivirus Program can be corrupted by any vicious virus and cease to work. How can you test that whether your Antivirus program is working fine or it is dead? We will be needing a virus. OMG! Real virus can test your Antivirus and your data well but its a risk. Using real viruses for testing in the real world is rather like setting fire to the dustbin in your office to see whether the smoke detector is working. Such a test will give meaningful results, but with unappealing, unacceptable risks. So, We happen to have a simple test for that. We have a harmless fake virus for testing purpose.