The specified CGI application misbehaved

I have searched the http://bugs.php.net/search.php site for the following problem and have tried most, if not all, of the suggestions for fixing this when running a test.php page: "CGI Error The specified CGI application misbehaved by not returning a complete set of HTTP headers. The headers it did return are:" The single line of code I tried, per the .cgi manual install instructions, is: <?php phpinfo();?> The code will run fine from the command line in the PHP directory. I have installed PHP 4.3.0 on an NT Server 4.0 SP 6a IIS 4.0 machine, and granted appropriate file access to users. I have read repeated comments about system speed, so I even slowed it down with no luck. (There are no background/foreground tab options in 4.0.) I have tried .ini changes that include \ and / slashes appending file locations with no help. Any ideas? Thanks in advance, Mark