I can't watch flash videos, please help?

Recently I haven't been able to watch flash videos on certain websites. I can still watch youtube videos and videos from xfinity (comcast) and most other websites. i cant watch videos from www.webkinznewz.ganzworld.com or from cbs news or from the NFL website. all i get is a black screen. it really bothers me because i want to watch the videos on webkinz newz to win prizes, but i cant because of this. I have tried on internet explorer, firefox, and chrome and it doesnt work on any of them. i have windows 7 (64 bit i think) and the latest version of each internet browser mentioned above. i also have the latest version of flash player installed too. Please help, i would gladly appreciate it. Thanks! :)