If Google or Yahoo! search engine result pages (SERPs) display a warning about your site, the most common cause is that your site was hacked. Please see the separate article about how to investigate and remove the Google / StopBadware warning message.
If visitors report to you that they get virus alerts or viruses from browsing your pages, your site is most likely hacked. Google and Yahoo! will start displaying a "badware" warning about your site soon, so see the article about it, above.
It is, however, possible for your pages to deliver viruses even if your site hasn't been hacked. This can occur when your pages pull some of their content from third parties such as advertisers, and they got hacked or someone slipped a malicious advertisement into their lineup. That scenario is also discussed in the article above.
If people try to visit your website but wind up somewhere else instead, it's another sign your site is hacked. It's a similar situation to the two described above and will eventually earn a Google or Yahoo! "badware flag". See the article referenced above.
Most web surfers heed the "This site may harm your computer" warning and stay away. Those who continue to the site and get a virus or virus alert will leave immediately and not browse around. Either way, you'll see a drop in traffic. Anytime your traffic drops suddenly, investigate.
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