Codec Guide

(I'm bad at English)

I've installed XP home, WMP11, then KLMCP.
I've watched some DVDs and everyting was perfect.
Later, only one thing was installed before bug appeared - WMP11 two updates.
[Note - XP and DVDs are licensed]
How bug looks:
Umm... its like bad deinterlacing sometimes...or bad interlacing - i dont know this termin exactly, but it looks wery annoying.
After reinstalling WMP11,updates,KLMCP nothing fixed.
But if i use ffdshow for DVD (libmpeg2),
there is no bugs, but picture is worse and wrong proportions.
I wery like cyberlink, so how to remove this corruption?

Ask if you need more details.

Hope for help

PS When i havent got E-net, and was 'pure' XP SP2 and WMP11
there is no such bugs with DVD