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Most anti-virus internet security software and firewalls can handle most of the well known Trojans, but none are perfect. You absolutely must make sure you have the very latest update files for your programs, or else they will miss the latest Trojans. Compared to traditional viruses, Trojans evolve much quicker and come in many seemingly innocuous forms, so anti-virus software is always going to be playing catch up. Also, if they fail to find every Trojan, anti-virus software can give you a false sense of computer security, such that you go about your business not realizing that you are still dangerously compromised. You also should not temp fate. Never open an attachment on an email if you don't know what it is.