I must confess I don't know how to fix it, but if you're trying to run it specifically to watch Quicktime .mov files, I'd suggest trying a program called Media Player Classic - click here to download it.

Hope that helps.

Which version of Quicktime do you have?

I'm running version 7.1.3

Does this happen with all quicktime files? (also from the Apple Quicktime Trailer website?) Or are you trying to run for example an Computer Based Training course which uses quicktime? As for example VTC uses a special container around the quicktime file to make sure that you cannot copy / play it and you would need a special player, provided by them, to play it.

If your computer fails to play all quicktime files try using Quicktime alternative instead.

Nope that didn't work either

I'm trying to use it to view videos and other files online. mostly just anyform of streaming, but anything I try and view just doesn't work

I think my computer is just to crap.

Your firewall isn't accidentally blocking your players is it as that would make streaming pretty much impossible.