How can I find out if my site has been identified as a web site that hosts or distributes malicious software and what can I do if it has?
You can find out if your site has been identified as a site that may host or distribute malicious software (one type of "badware") by checking the Summary page for the site in Google webmaster tools. (Note: you need to verify site ownership to see this information.)
This identification is based in part on guidelines set by StopBadware.org. However, Google uses its own criteria, procedures, and tools to identify sites that host or distribute badware. If you feel your site has been mistakenly identified, or if you make changes to your site so that it no longer hosts or distributes malicious software and you secure your site so that it is no longer vulnerable to the insertion of badware, you can request that your site be reviewed.
All requests for review are handled by StopBadware.org. You may submit a request for review from the following link:
http://stopbadware.org/home/review. StopBadware.org will investigate and contact you with its findings. If they determine that your site does not host or distribute badware, they will inform Google, which will remove the identification from the search results.