Forget the multiple user accounts - what a pain. Definitely not necessary.
I do not run any anti-virus on Mac. I dual boot via Boot Camp into Windows. In Windows, I run one app only. I never download "fun" apps or anything while in Windows. I use it for a VB app and I go back to OS X.
Basically, your Mac is safe. If you Boot Camp Windows, either do not download anything questionable or use an anti-virus program in Windows only.
I do not run any anti-virus on Mac. I dual boot via Boot Camp into Windows. In Windows, I run one app only. I never download "fun" apps or anything while in Windows. I use it for a VB app and I go back to OS X.
Basically, your Mac is safe. If you Boot Camp Windows, either do not download anything questionable or use an anti-virus program in Windows only.