I installed VirusScan 8.6.1 several days ago on 2 PPC Macs (a desktop and a laptop) and the software caused shutdown kernel panics on both machines. It also caused intermittent interruption of the audio on the laptop. I've uninstalled the software. To add insult to injury, I called their customer service # and explained the situation to the first rep I got, and she suggested I talk to tech support. I politely declined and said I want a refund. Again, she said she would transfer me to tech support. I said please, do not send me to tech support - I don't want the software, I want a refund. And she transferred me to tech support anyway. After being on hold for 12 minutes, they disconnected my call and I had to start all over. I'm now 11 minutes into my 2nd call. Don't buy the software and don't wasted your time with this company - they don't know what they're doing in the Mac environment.