Hello. I use a Mac and have never owned any anti virus software. Recently I became suspicious that my Mac might be infected with a virus. I purchased Norton for Macs, discovered I did have a virus and removed it. Apparently it CAN happen to a Mac! I am alerting the few emails I contacted after the infection. If you have anti virus software you should have no problems. If you use a PC, this was designed for a Mac. (Mac only is the presumption). If you use a Mac, and have no anti virus software, perhaps you could download a free trial from Norton or McAfee, etc, to check for infections. I'm sorry for the inconvenience. Harvey,