Never, I have an iMac.
A virus (or trojan, I'm not sure) spoiled my last Windows PC some years ago. That's one reason why I switched to Apple. The other reason is: In my opinion the Apple iMacs/Macbooks are excellently designed.
And CIV IV - the only current non-console game I play - is also available for Macs. Spore will be, as well.








