Cpu load very hight during/after watching

[TheDrake]

:? :? Hey there.. can anyone help me with this problem?

I have no problems playing movies etc.... but whenever I play a movie Explorer.exe suddenly starts using 90% of the CPU ( looking at the Windows Task Manager). After I close BSplayer the problem continues..... not constantly but instead cycles up and down from 85-90% even when nothing else is operating
cpu intel P4 3ghz, 1gb ddr 400 dual, asus gefoce 5700 128mb
Windows XP SP2 + update with www.windowsupdate
bsplayer100.814 or 812 (same problem)
Codec DivX521XP2K.exe
Driver video nVidia last release

Thanks for help