A survey of home PC users found 81 percent lacked at least one of three critical types of security, but the number of consumers using firewalls and updated antivirus software is improving, according to a report released Wednesday.

The vast majority of consumers surveyed were found to lack at least one of three types of critical security--a firewall, updated antivirus software or anti-spyware protection, according to a report by America Online and the National Cyber Security Alliance.

Of this group, 56 percent had no antivirus software, or had not updated it within a week, while 44 percent did not have a firewall properly configured, according to the report. Meanwhile, 38 percent of survey respondents lacked spyware protection.

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