Why wont my computer let me see you tube videos anymore?

i always watch you tube videos but my comp says:
Hello, you either have JavaScript turned off or an old version of Adobe's Flash Player. Get the latest Flash player. what do i do???
Update: it says when i try to watch one:
Hello, you either have JavaScript turned off or an old version of Adobe's Flash Player. Get the latest Flash player.
it wont let me get it!!!
14 answers 14