quicktime problem

[VroomPshhTsi]

Hey guys, every time I visit a site with a quicktime plugin it won't work (videos). It just shows the quicktime symbol and a question mark. I have the latest version downloaded. I use to use Crazy Browser which wouldn't show quicktime vids but did show most ads. Now I have Firefox and neither ads nor videos (like from collegehumor or streetfire) work. Any computer guys out there that can help me?

[wikked]

I'd try reinstalling it first:

http://www.apple.com/quicktime/download/standalone.html