Greetings. In light of recent malware alerts on the Mac, it got me thinking about the security of my Mac. I frequently download files such as roms , sometimes from untrustworthy sites and the idea of my computer being infected has been bothering me. So i just have a few questions. As a precaution, i set a random and long password for my Mac, and i was wondering if any form of malware would be able to bypass this. Anywho, assuming i had any form of malware on my computer, would erasing the data by overwriting all the data with zeros 7 times and erasing free space remove the malware? (btw, what does it mean by erase free space?) Would the malware remain or be removed? In addition, would a malware be able to infect the install disc whicch i am using to clean install? Finally, would the malware be able to reinfect using my IP address? Thanks, genuine answers are greatly appreciated.