Be security conscious (Tip 10)

[pioneer]

Never open a suspicious e-mail attachment even if it’s from someone you know. Viruses can infiltrate e-mail contact lists. Choose a strong password that no one will guess. ILPC4F (I like playing chess for fun) is a much better password than your birth date. Test your computer regularly for security vulnerabilities. Relying on a NetBIOS file-sharing port is like leaving your Ferrari unlocked with the keys in the ignition. (ririanproject.com)

P.S. Use AVG Anti-virus. It's free. You can download it from www.filehippo.com