Could you please check the following page? http://helpx.adobe.com/flash-player/kb/find-version-flash-player.html
Does it tell you that you have 11.4.402.278 version?
I downloaded Flash Player from http://get.adobe.com/flashplayer/. It installed the correct version. (11.4.402.287)
What files do you have in folder C:\Windows\system32\macromed\Flash ?
According to the website linked, I have version 11.4.402.278. Downloading from the provided link #2, it still is the same file.
When checking that folder, it does confirm I have .287. However, the link for verify my Flash version does not recognize it.