.flv and .avi won't play any more.

I had all the relevant codecs and was able to play .flv files in QuickTime and in VLC Player and also .avi files.
I reformatted my MacBook Pro for unrelated reasons, and now since installing all the same codecs etc. I can't play .flv files and also I have .avi movies which play with no sound in QuickTime, whereas they used to before reformatting.
I have installed:
QuickTime Pro 7.5
DivX
XviD Codec 1.0
VLC Player 0.8.6i Janus (Intel)
Perian 1.1
Does anyone know why suddenly there is no sounds for .avi in QuickTime and .flv won't play at all in QuickTime, VLC or the DivX Media Player whenever it used to work fine? I don't want to have to install more media players.
Cheers.

Same problem as Somhairie...
But only .flv files won't play. More exactly I've lost the sound.
despite what you say, Toronto..., I had the same codecs installed as described by Somhairie and it worked fine before I reinstalled all OSX.
Some new ideas someone ?
thank

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