Virus
Virus is computer codes designed to self-replicate, damage, or otherwise hinder the performance of a computer's memory, file system, or software.

KEEPING THEM OUT……….
Make sure that your computer is installed with the latest anti-virus software. Old software does not provide anti-spyware/ adware, anti-phishing, and vulnerability assessment or wireless intrusion detection. Among the leading software are Trend Micro PC-cillin Internet Security 2005. If you don't have anti-virus software installed, you can get it from one of several companies.

Trend Micro

Microsoft

McAfee