F-Secure Health Check enables Internet users to perform a comprehensive over-the-web check on the overall security status of their PC, including the operating system, web browsers, email clients and other application software. The service is designed to verify if a PC is safe to use online and to help users solve potential security problems in their PCs with assisted software upgrades and security advice.

The service is free of charge for end users. To check your Windows PC, simply use Internet Explorer 6 or higher to access the web site and start the F-Secure Health Check service.

http://www.net-security.org/secworld.php?id=5701