It hasn't got as far as build.xml
The problem seems to be in ant.bat.
Try adding some echos before it runs the java command,
to see the actual command line.
Have you defined ANT_HOME?
It seems to be a v1.4.1 bug under W2K
I have installed old v1.3 and it worked fine,
so my environment variables were well setup.
I am going to post the problem to the apache website.