I had visited a website then was told that I might get a malware there. I haven't seen anything suspicious on my Mac. I didn't give my administrator password to any pop up dialog either. My OS is Snow Leopard. Here's the link to that website (please don't click on it if you think it might be dangerous) http://x-cafevn-db.info How could I check if my Mac already got infected? A second question: about Symantec Antivirus. I installed and removed this software long time ago when I was using Tiger. After upgrading (not clean install) to Snow Leopard, there are errors message pop up every time I start the system. This didn't happen with Tiger though. The message says: "Symantec Antivirus Error Symantec AntiVirus Auto-Protec could not continue. Please run LiveUpdate or reinstall Symantec AntiVirus and restart. (Code: 10)" No file shows up when I search for Symantec in Finder. How could I get rid of those messages? Thank you.