Missing Codec

Hi all, when starting iMovie I get an error message saying the codec for importing editing watching movies is missing, i did a google search but cant figure it out, i have updated my iMovie.
Also, I cant play any quicktime movies with quicktime if this is of any help.

Any ideas please..

What type of video are you trying to import? Also, what do you mean you can't play QT movies in QT?

Any video, I get the warning when I open iMovie, it says the missing codec is supplied with the installer, so i reinstall, 3 times and nothing.

I cant open quicktime movies, he file has a qt logo so i open with qt and it says this file is not a qt file, when i know it is. Any help.

if its an avi, then try installing Perian, which extends QuickTime's codecs beyond what Apple supplies

Perian - The swiss-army knife of QuickTime® components

For Windows Media up to version 9, install Flip4Mac

Windows Media® Components for QuickTime

Still no joy! Will take it into my local apple shop I think, driving me mad! Will report back when I/they sort it! For some reason the Mac isnt working how it should do..

Thanks

Have you tried reinstalling QT?