Innovative Solutions, the company behind DriverMax and Advanced Uninstaller, have just released thier own antivirus, Orange Defender. According to their website, it is "The best security system ever created." In reality, it is a very basic antivirus using the same UI design they use for their other products, and Avira's scan engine. As you can see from the screenhots below the UI is extremely basic. It would seem that is has no proactive protection. You can buy it for just $15 (but I don't know why you would). The trial version if fully functional for 30 days.