I have owned this laptop now for about a year and a half. It has OS X 10.6.8. lately it is beginning to develop a worsening problem. The curser is acting erratic and locking up for a few seconds and the occasions of these freezes are getting more frequent. Someone suggested It was a Trojan, however I was led to believe that would not happen with a Mac?? If this is a problem how do I get rid of it and or cure these freezes? My updates are automatic and I am updated on all but my printer softwear and I-tunes at the moment.