Users viewing AdSense ads in Internet Explorer 6 or 7 over the last few days were prompted to install third-party software, according to forum posts on WebmasterWorld. The applications included QuickTime, Acrobat, Flash and Windows Media Player. The problem was first brought to Google's attention on August 11 and was addressed August 15. According to a forum post by AdSenseAdvisor, the problem has now been fixed.
Google did not immediately return a request for comment. Some forum posters, however, said they believe that Google was intentionally trying to install software without users' knowledge. And some users report that the issue has not been entirely rectified