why do I keep getting prompted to install quicktime when i have done that already?

I went to the apple trailers website to check out some trailers. Every one I click on brings up a popup that shows me the quicktime logo and if I click it I am prompted to download/install quicktime. I've installed, and reinstalled, quicktime a couple times now....still the same problem.

I'm using google chrome as a browser.

Can anyone help me out?