
Originally Posted by
Shooty*
umm.... would it not help to install some codecs?
Edit: I'm just saying that trying to play things back without codecs, as you seem to be doing ("I’ve installed Win 7 twice now with no codec packs") seems to be like making a cheese sandwich, saying "yeah, I'm really looking forward to this cheese sandwich, this cheese sandwich is gonna be awesome". And then realising that you've not got any cheese.
Edit number 2: Clearly, you're relying on the pre-installed Codecs. have you run G-Spot or other codec identifier to see what codecs are needed?