A couple of days ago my computer was giving me grief (audio driver conflict) so I backed up all my work onto a different hard drive and reformated the main one.
After re-installing windows xp, getting it all up-to-date and installing directX 9, plus the 77.77 Nvidia video drivers, I downloaded the latest versions of DivX and Quicktime so I could watch my videos.
However when I tried to play the sample Quicktime 7 movie the quicktime player showed just white, and then if i pressed play it would play for 2 seconds then use 100% CPU power and I'd have to kill the process in the Ctrl+Alt+Delete thing.
The same goes for .avi, .mpeg and any other video files, except that for Media Player before I installed DivX, was able to play the audio of an .avi file. I can also see a preview screenshot of the video file inside a folder (the little thumbnail view option on folders)
This hasn't ever happened to me before and I've done 6 or 7 reformats in the past just to clean everything up and start again and they always worked fine. Since this is the only PC I have for work (I'm a freelance animator) it's a rather urgent request for help.
Since it seems to be application non-specific I'm guessing it's a hardware or windows problem (but everything worked before i reformatted).
AMD Athlon 3100+
ASUS A7N8X-E Deluxe Motherboard
Nvidia Geforce 6600 GT 128MB
2 NTFS formatted Hard drives (1 partitioned)