HTTP error 500 Internal Server Error

I'm trying to move over one of my web apps to a new server running IIS7.5  I've installed php and have it fully configured, but for some reason I cant browse to my application.  I get the following error:

HTTP error 500 - Internal Server error

C:\php\php-cgi.exe - The FastCGI process exited unxpectedly

Detailed error info

Module:  FastCgiModule

Notification:  ExecuteRequestHandler

Handler:  ph-5.0.4

Error Core:  0x0000000ff

Anyone have any ideas?