flash not working on a page

Hi,

Videos on this page doesn't load;

http://www.antena3.com/videos/espejo-publico.html

every once in a while ask to install the flash player like it wasn't installed already.

All other pages like youtube and other online TV pages work fine.

system info:

Adobe Flash Player 11.6.602.171
Windows 32-bit , spanish, MSIE-8

thanks