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You may download and use it absolutely free of charge.
It features high detection rates for viruses and spyware; scanning scheduler; automatic downloads of regularly updated Virus Database, and others.
Simple Spreadsheet is a bare-bones spreadsheet available for free, including sources. All of the self-contained, standalone applications require no installation, whatsoever, and for this reason make the perfect companion software package for your USB stick.
It is not a substitute for full anti-virus protection, but rather a tool to assist administrators and users when dealing with an infected system.