It’s OK, but I don’t recommend running any AV on Macs. Unless you are desirous of preventing the re-transmission of Windows viruses in forwarded emails, there is currently little purpose in running one on an OSX Mac. There are Zero known self-relocating, self-installing, self-transmitting viruses for OSX and only 22 Trojans in five families, all of which are easily avoided and identified by the OS itself which will warn the user if he attempts to download, install, or run one of them. Apple pushes updates to that Trojan identifying system since the MacDefender Trojan reared it’s head. I’m not sure about Intego but at least one of the free Mac AV solutions TURNED OFF the native anti Trojan protection so THEIR AV could report finding some Mac malware... Turning it off was necessary because the OSX Trojan protection intercepted the malware before the AV could see it!
Self-relocating=self-replicating. Dang auto-correcting dictionary.
From what I’ve read about Parallels, you have to have a program to firewall and protect the Windows folder under Parallels, as if it were a separate computer.