Internet explorer not working with webplayer

Hello everyone

I have a problem with my webplayer game when I try to play in internet explorer. It appears the image to download the plugin, but it is already installed. And if I reinstall it, the problem not gone.

It works fine in firefox and chrome in windows and firefox, chrome, safari in mac. I am using internet explorer 10 with windows 7. Unity webplayer plugin and unity editor in last version 4.1.2f1.

Any idea?