Try running McAfee Stinger - special tool for handling fake anti-malware programs.
You can download the FakeAlert Stinger from the following location:
An article is available at http://service.mcafee.com/FAQDocument.aspx?id=TS100893 that discusses this tool as well as instructions for use.
Hope that helps,
Sorry i have written in portuguese.
I had a similar problem yesterday, but did not do the operation and closed the browser. I think the virus has not arrived to settle, but even so, I scan with my anti virus (McAfee Internet Security 2010) and did not show any problem. In reading your response, I did dowload stinger and did the scan. As a result appeared "number the clean files: 118778. I was in doubt whether they were the files that the stinger cleared or were the files that were already clean. Thanks
This number refers to the files on your computer that Stinger scanned and decided they are already clean.