Free Anti-Virus Software for Home Use
The biggest problem with anti-virus software is keeping it up-to-date with the newest signatures published by the vendor of the software. However, you don't have to pay an arm and a leg to get good anti-virus software, and you don't even have to pay to keep it up to date!
Quality, free anti-virus software can be found from Grisoft. Called AVG Anti-Virus it
can keep close tabs on your machine and all of your e-mail and
You'll have to dig around in Grisoft's site a bit to find the software -- they do want you to buy the subscription (i.e. paid) version. Just keep following the links to the free version.