Having powerful anti-virus software, like the options in my security center, is essential. But how can you know if your security software is working properly? For most people, the "no news is good news" approach isn't enough.
Try this file to test out your security software. It's branded as a virus, so a good anti-virus program should detect it. However, it's not actually a virus; it's just a simple text file that can't hurt your system.
Make sure your anti-virus software is running and then download it. If your anti-virus software flags it as malicious, then you don't have anything to worry about. If it doesn't, it's time to upgrade or try a new program.