Yes, you are right. If you installed no av version, the virus alert from clamav should not popup. To make sure, you may want to test it again to see whether the virus alert is from ClamAV or Universal AV. If you see ClamWin, then the scanning result is definitely from Universal AV. To be sure, you can refer to those virus alert screen shots which I had posted in my earlier post. If you have installed the full version, you can select the "Disable Offline Antivirus" option at "Scan Settings", click on "Apply" and then reboot your computer.