Google Warning :This site may harm your computer

Google puts this warning flag in its search results for pages where its automated web crawler was attacked by viruses or spyware when it visited the page. The purpose of the warning is to help protect web surfers who are using Google search results, by steering them away from malicious pages. Yahoo also provides similar warnings on its result pages.

The warning is not a punishment or penalty, and it does not mean that Google, Yahoo, or StopBadware think you designed your site to be malicious. They all know that the overwhelming majority of webmasters do not create malicious pages on purpose and that you probably didn't, either. But they also don't want to send their customers to dangerous pages, and they do require you to do the necessary cleanup before they start referring visitors again.