ZoneLabs offers its ZoneAlarm in free and paid versions. Symantec sells the Norton Internet Security suite. Other firewalls are available for PCs and Macintosh machines. You may need more than just a firewall. GFI Ltd. sells LANguard File Integrity Checker for Windows.
Many viruses piggyback on computers address books to propagate themselves quickly.
To combat password theft, Trilling recommends making passwords as long as possible. Many hackers use cracking programs that incorporate English dictionaries so use uncommon or foreign-language words. Better yet, use random combinations of numbers and letters in upper and lower cases. Do so regularly - weekly, if not daily. The majority of computer users still don t update their systems for weeks, if not months, security experts complain.