I found DVD playback became viable as we passed 500 and up MHz on the p3. 450 is just too low to expect this to work all the time.
If it did work in the past my bet it was with older versions of software. (yup, wmp9!)
There is no fix planned to address this.
I have Win XP SP2 OS on my PIII 450 MHZ PC with 256 Mb RAM. Everything was fine untill I upgraded to WIndows Media Player 10. After installing WMP 10 most of the Video files play choppy (about 2-3 fps) and CPU Usage becomes 100%. The playback becomes further slow when I select full screen playback. I tried installing several Codec packs but that does not help. There is nothing wrong with my hardware as it was working fine with WMP9. Any suggestions to overcome this problem or advice on how to revert to WMP9 will be highly appreciated.