Hello Michael,
I must admit that I have never used the Express Setup but I wonder if it requires special HTML files to be extracted into the FLASH of the 2950 before using the Express Setup. It may well be possible that you need to have the web manager files extracted into the FLASH memory before using the Express Setup.
I know that this does not answer your original question but if you need to configure your switches with basic settings, you'll be better off with CLI, and if you are not familiar with it just please tell me what you need to configure, and I can make a short config here tailored to your needs.
Best regards,
Peter