[plt-scheme] Web application example

Hi everyone,

I'm trying to get up and running with a basic web application, but the
most basic examples aren't working for me.

http://docs.plt-scheme.org/web-server/insta.html
http://docs.plt-scheme.org/web-server-tutorial/index.html

The first example on each of these pages gives me the following error:

standard-module-name-resolver: collection not found:
#<path:web-server\insta\lang> in any of: (#<path:C:\Documents and
Settings\Administrator\Application Data\PLT Scheme\4.1\collects>
#<path:C:\Program Files\PLT\collects>)

I'm running PLT Scheme 4.1, Windows XP.  I haven't got the foggiest
what I'm doing wrong.  Could someone point me in the right direction?

Thanks!
Beth