Win32 Apache 2.0.43 and PHP 4

My problem is getting PHP to work with apache.

As per the directions in the several books I have. I have added the
following line the httpd.conf in the spot require (by the book and
with common sense (just added it to the last line of the rest of the
statement that look like it)). Without the line for PHP the apache
server starts no problem (tested OK). When I add the line is will not
start ERROR.

The line is "LoadModule php4_module
C:/php-4.2.3-Win32/sapi/php4apache2.dll"

I copied the files requested in the directions from the book to the
\Windows\system32 directory. The service starts just fine until I add
the line above. I verified the path to the dll files and it is
correct. Oh, I just added the quotes marks around the statement, I
know they are not part of the script.

The specifics and the system:

Windows XP
Apache 2.0.43
PHP-4.2.3-win32

I just don't know what else to do.

Can anyone give me any ideas?

Thanks for the help.