For several years, Microsoft has offered a free antispyware program called Windows Defender. Now, thanks to loyal blog reader Gerard, I've learned that they have released a new product that also incorporates antiviral technologies. Best, it's totally free for home and small business users (up 10 PC's).
Until now, I've recommended AVG for antivirus software. But when my paid AVG subscription expires in February, I will switch over to Microsoft Security Essentials. I recommend you do the same.