Follow this steps for Flash Player Error u getting for FB videos....

1) Uninstall Flash player from system (Control Pannel > Add/Remove)

2) GO to Site http://www.adobe.com/special/products/flashplayer/fp_distribution3.html Download Flash Player based on ur Operating system ( 32 Bit or 64 Bit)

3) Close All Browsers Install Fresh Copy of Flash Player...

Enjoy..