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http://techlogon.com/2012/06/04/flas...-web-browsers/
Disable Flash hardware acceleration
The aim is to eliminate hardware or driver incompatibility issues with Flash Player. Right click on the video picture during playback of any Flash video in your browser and, from the context menu, select ‘Settings…’ as shown below:
This opens the Flash Player Settings window. The Display panel is the first panel (tab) shown at the bottom of the Settings window.
Untick ‘Enable hardware acceleration’ in the Display panel then press Close. Now see if Flash Player works ok.
If the problem is fixed and Flash does not crash, you probably had a driver (software) issue with your graphics card.
[If you ever want to try enabling hardware acceleration again (by re-ticking the option you just un-ticked above) you should first
update yours graphics card drivers.
Driver updates can fix issues with how Windows or programs like Flash Player work with a graphics card, or enable new features for it].