The Conficker Working Group has produced a quick way to check if your Windows PC has a Conficker infection: the Conficker Eye Chart. Go to the site, and if you're one of the 99% or so that don't have it, you'll see the image above. If some of the images are missing, then you may have it.
The test is based on Conficker blocking access to some anti-virus sites. It should be accurate, unless you're using a proxy server.
