codec installation problem ?

In the readme of the "windows-essential-20061022.zip" it says all I
have to do is place the files in the "C:\Program
Files\mplayer\codecs\" folder (I am using the prebuilt windows
mplayer).

However when I then run, mplayer says wmv9dmod.dll cannot be found and
then stops with an error:

---------------------------------
C:\Program Files\mplayer>mplayer -playlist
http://www.viewtv.co.uk/156/asx\156.asx
MPlayer 1.0rc1-3.4.2 (C) 2000-2006 MPlayer Team
CPU: Intel(R) Pentium(R) M processor 1300MHz (Family: 6, Model: 9, Stepping: 5)
CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 0 SSE2: 0
Compiled with runtime CPU detection.
Resolving www.viewtv.co.uk for AF_INET...
Connecting to server www.viewtv.co.uk[217.10.152.194]: 80...
STREAM_ASF, URL: http://www.viewtv.co.uk/156/asx/156.asx
Resolving www.viewtv.co.uk for AF_INET...
Connecting to server www.viewtv.co.uk[217.10.152.194]: 80...
size_confirm mismatch!: 22611 28271
Error while parsing chunk header
Failed, exiting.
Resolving www.viewtv.co.uk for AF_INET...
Connecting to server www.viewtv.co.uk[217.10.152.194]: 80...
Cache size set to 320 KBytes
c:/winnt/fonts/arial.ttf doesn't look like a bitmap font description, ignoring.
Cannot load bitmap font: c:/winnt/fonts/arial.ttf

Playing mms://stream01.prostream.co.uk/moovee.
STREAM_ASF, URL: mms://stream01.prostream.co.uk/moovee
Resolving stream01.prostream.co.uk for AF_INET...
Connecting to server stream01.prostream.co.uk[217.10.152.220]: 1755...
connection timeout
Resolving stream01.prostream.co.uk for AF_INET...
Connecting to server stream01.prostream.co.uk[217.10.152.220]: 80...
Resolving stream01.prostream.co.uk for AF_INET...
Connecting to server stream01.prostream.co.uk[217.10.152.220]: 80...
Cache size set to 320 KBytes
Cache fill: 12.50% (40960 bytes)
ASF file format detected.
VIDEO:  [WMV3]  720x576  24bpp  25.000 fps    0.0 kbps ( 0.0 kbyte/s)
Clip info:
 name: You're Watching View TV
 author: www.viewtv.co.uk
 copyright:
 comments:
==========================================================================
Opening video decoder: [dmo] DMO video codecs
IMediaObject ERROR: 00B84D00  could not open DMO DLL (0x0 : 0)
Failed to create DMO filter
ERROR: Could not open required DirectShow codec wmv9dmod.dll.
You need to upgrade/install the binary codecs package.
Go to http://www.mplayerhq.hu/dload.html
VDecoder init failed :(
Opening video decoder: [dmo] DMO video codecs
DMO dll supports VO Optimizations 0 1
DMO dll might use previous sample when requested
GetOutput r=0x0   size:1244160  align:1
StreamCount r=0x0  1  1
Decoder supports the following formats: YV12 YUY2 UYVY YVYU RGB8 RGB555 RGB565 R
GB24 RGB32
Decoder is capable of YUV output (flags 0x1b)
VDec: vo config request - 720 x 576 (preferred colorspace: Packed YUY2)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
VO: [directx] 720x576 => 720x576 Planar YV12  [fs]
Selected video codec: [wmvdmo] vfm: dmo (Windows Media Video DMO)
==========================================================================
Audio: no sound
Starting playback...
Ahhhh, stream_chunck size is too small: 4
Error while parsing chunk header


Exiting... (End of file)

C:\Program Files\mplayer>
-------------------------------

I've also tried putting the essential files in "C:\Program
Files\mplayer\codecs\windows-essential-20061022\" folder but get the
same result.

This is on a win2000 PC

thanks
Robert