I suck at computer stuff, help!

[It's Just Eric]

Well, everytime I visit a website with any form of video, audio, or moving animatd anythings, it either freezes, or closes and immidiatly displays this message


At first, Im like "Shockwave flash!? What is that? Some kinda...vodka and energy drink?" but soon found out it was actually some sort of "Makes my computer play Top Gear videos"
I figured I had an old version, and I did, so I upgraded. No change. I also updated firefox to a more current version, thinking mabey there's some compatability issues. I fiddled with firewall settings, and even tried turning it off for a short time thinking mabey bill gates doesnt like supercars

Um...Im prettymuch computer illiterate, and Im sure what I jsut typed is making people in the know laugh their butts off, but Im clueless, and need a hand here. Any advice?
-Eric