I have a 08' 4g MBP running Snow Leopard OS X 10.6.8; I would like to know some key issue's to look out for in Utilities such as, activity monitor, console and network utility, etc. I have no anti-virus type software that i bought after initial purchase, but i can't seem to find out if Yahoo is giving me malware or Trojan problems at all. I would also like to know how to manually find out if i have either one of them. Yahoo seems to be the trashiest internet service ever made (Facebook sucks too). If anyone would share a tip or two on how to keep a Mac crispy and clean and alert, drop me a post. Thanks a ton if you do.