Schema (20010502) Validator problem

Hi,
I tried validating this schema:
 
http://www.oten.edu.au/development/mf/schemas/sco_media_hdr_v01.xsd
 
using the Schema (20010502) Validator located at:
 
http://www.w3.org/2000/09/webdata/xsv
<http://www.w3.org/2000/09/webdata/xsv> 
 
And received the following error message:
The download of the specified resource has failed. Error processing resource
'http://www.w3.org/2000/09/style/xsv.xsl'. 
The message appeared if I used either of the first two options. The third
and fourth options worked fine.
I am running IE 5.5 with the MSXML3 parser installed.
Thanks,
 
Mark Focas
Multimedia Developer
OTEN
51 Wentworth Road
Strathfield
NSW 2135
(02) 9517 8033