The folks who write malware and virus are not just smart at writing them, they are also very smart at camouflaging their stuff in such a way that unsuspecting users may easily get fooled to believe that they are actual doing something legitimate.
Many malware and virus thrive on SEO poisoning for popular search terms. They make use of the fast indexing capabilities of Google to get indexed for popular search terms, especially "sex scandals" and "sex videos".
A recent analysis from the folks at Sophos Labs, uncovered several URLs which made it to Google through blackhat SEO, however, the more interesting finding was that, malware and virus writers have now started to generate spoof screens which look similar to Windows 7.
When users visit sites which host such malware, they will come across an interface which is similar to Windows 7, with a popup which looks exactly like the security center popup for Windows 7. Furthermore, the malware site also displays fake antivirus scan results which show the user that there are several viruses installed on the PC.
It is easy to get fooled because of the stark similarities between this Fake antivirus, however, users should know that they are using a web browser, and such scans are not carried out by Microsoft in the web browser.
Though the looks may be deceiving, you should not click on any security related or free antivirus scans on a web browser. Additionally, many modern browsers are smart enough to block such malware sites, so make sure to keep your browser upgraded to the latest version.
You might also want to check on some tips we had written earlier to keep yourself safe on the internet.