FastCGI Activity Timeout on IIS7/Vista Business

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Got everything configured, and set up an administrator account -- that part worked flawlessly.

When I try to access the login page, the browser loads a generic IIS 7.0 500 Error page with the message:

Error Summary
HTTP Error 500.0 - Internal Server Error
C:\PHP\php-cgi.exe - The FastCGI process exceeded configured activity timeout

Has anyone else encountered this issue? What do I need to do to fix it?

Thanks!
rob