How  to prevent worm?

There are few basic steps that users should do to protect against most computer worms. First, a computer’s user accounts should be set so that day-to-day use is run as a limited user who cannot automatically install software in the computer and administrative accounts with full installation rights should be used only to install, modify or delete software.

Next, all network firewalls, whether in a computer or on the network, should be configure properly to restrict the network traffic and turned on to limit unauthorized network activity, and the computer’s operating system should be set to automatically install system updates.

Last but not least, robust anti-virus software also important to protect from malware and it should be installed in each computers and set to automatically update and scan the computers regularly. Free anti-virus software do the job, but paid products add important features such as download and attachment scans and malicious websites screening.