Cannot participate in the SQL 2005 E_Learning

I cannot successfully participate in the SQL 2005 E_Learning course at this link:

https://www.microsoftelearning.com/sqlserver2005/

And accessing the course on thisl link:

Course 2936: Installing and Securing Microsoft? SQL Server? 2005

Following this link:

Test your computer's capabilities

Yields error this message:

Directory Listing Denied

This Virtual Directory does not allow contents to be listed.

I'm using professional XPSP2:3283. A collegue using professional XPSP2: has no problem.

ActiveX & Java are enabled and the system is patched with everything except Mediaplayer 10.

If I try this in Firefox, I can get as far as the lessons but the lessons will not 'launch'.

Any help will be vastly appreciated! Thanks.

This is far outside my area of expertise but a few moments poking around the e-learning website provided this link :

https://www.microsoftelearning.com/help/contactUs.aspx

Hopefully they can help you out!

Paul