Google this and pick the article you like and understand.
-> DISABLE FLASH HARDWARE ACCELERATION
As to the trackpad, to test if that is a hardware failure, try an external mouse.
On my laptop, sometimes when I go on YouTube, my Internet explorer crashes and when I click my left trackpad button, most of the time, my laptop seems to register that I have clicked twice, when in fact I have only clicked once! Does anyone know how to solve this issue? Then please could you post it here?