I am not able to open any videos

Hi ggquilts,

I'm sorry to hear you are having issues playing website videos on your Mac. I also apologize, I'm a bit unclear on the exact on the exact nature of the issue you are describing, as well as your current system configuration (what version of OS X, web browser, etc). If you are having issues with video playback across multiple sites in Safari, you may want to check that you have the most recent compatible version of Adobe Flash installed and that it is active, as noted in the following article:

Adobe Flash Player updates available for OS X on November 20, 2014 - Apple Support

Regards,

- Brenden

Note Flash player support for Mac OS X 10.4.x and earlier is quite limited. See this discussion if that's what you are running:

Flash 11.5 hack for PowerPC