Microsoft has released a FREE antivirus solution for home PCs – Microsoft Security Essentials. It provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software. The software supports Windows XP SP2+, Vista and 7.
Security Essentials is a free download from Microsoft that is simple to install, easy to use and always kept up to date so you can be assured your PC is protected by the latest technology. Download it here