Install errors with O'reilly v 2.3.7

Hello, I am running NT4 / SP4 and O'Reilly Web Site Pro v. 2.3.7 I have PHP in d:\php I have all the dll's in the system32\ dir and the php.ini in the winnt\ dir I used the php.ini.optimized file and made the changes PHP.exe works from the command line. Is my version of O'reilly too old to run PHP4? If so, is there another version I could run? Variety of errors when trying to view a script in the browser. This error, if it is set to an isapi.dll An HTTP request resulted in the server responding with a "500 Server Error" response. The server logic generated the following message: Version ident mismatch in API extension "C:\WINNT\system32\php4isapi.dll" The request came from 66.109.137.35: GET /testcode/julie/hello.php HTTP/1.1 and this if it is set to CGI and php.exe An HTTP request resulted in the server responding with a "500 Server Error" response. The server logic generated the following message: Missing GetExtensionVersion() function in API extension "C:\WINNT\system32\php.exe" The request came from 66.109.137.35: GET /testcode/julie/hello.php HTTP/1.1 I originally had the php.exe in the d:\php dir but moved it in with the dll's at the end. Thank you in advance for any ideas. Julie