Alrighty! I got it! Wahoo!!
So yeah, I reinstalled everything again, so that made it like the 12 or 13th time I did the reinstallation of MySQL, Apache and PHP this weekend.
So you know what I did...
Instead of installing PHP 5.1.6 into a folder of ' C:\php5 ' like they said, I just did it to ' C:\php '.
Then, I made all the changes to the httpd.conf file that were necessary.
The issue that I did next, well my phpinfo.php file consisting of :
<?php phpinfo(); ?>
Was typed and saved by MS WordPad instead of Notepad. It work with that! Can you believe it! I mean, something so stupid as to MS WordPad versus MS Notepad. I can't believe it considering all that was asked was to type it into a 'text editor'!