A lot of people do see Adobe's support forum
Adobe said try this http://www.adobe.com/support/flashplayer
For some people, it may due to incorrect permissions in the registry, as here
It does not work for me! if you did try everything else, here is the one that worked for me - Download the IE plugin directly from here instead of install it over the internet:
fpdownload.macromedia.com/get/flashplayer/
