php only works in web root directory

I'm sure this is probably an easy one, but I'm stuck. I have php installed on a W2K system running IIS. I've gone through the install notes several times but I can't seem to get .php files working throughout the web site's directory structure. I've got an index.php file under root which comes up with no problem. However, if I name a file index.php in a directory underneath the root level, I get the following: CGI Error The specified CGI application misbehaved by not returning a complete set of HTTP headers. The headers it did return are: When I look at the source I see: <head><title>Error in CGI Application</title></head> <body><h1>CGI Error</h1>The specified CGI application misbehaved by not returning a complete set of HTTP headers. The headers it did return are:<p><p><pre></pre> I can take this file and move it into the web root and it works fine. Any ideas? Thanks, Phil. Tanner philip.tanner@stratus.com