Greetings,
We have a working Moodle installation with IIS 6.0, with the following versions installed:
1. Moodle 1.5.3+ moodle-latest-15.zip
2. PHP 5.1.2 - Download URL php-5.1.2-Win32.zip Follow this installation guide to the letter. Add Network Services to your Security permissions on the root web directory where moodle is located and give it write permission.
3. MySQL 4.1.16 - Download URL mysql-essential-4.1.16-win32.msi
4. MySQL 1.0 Administrator - Download URL mysql-administrator-1.0.21-win.msi Create a blank (no tables) database, grant the database full schmea privileges and adequate resources in the User Administration area.
Hope this helps.
Ted