Ah. I'm going out on a limb here, but you should see that the httpd.conf.default file is much larger in size than your current httpd.conf. If this is the case, take a look around for some of the lines that I describe in my article.
If you see then, then you may want to replace your current httpd.conf file with the default one. Only you can make that decision, of course.
To do so, make a backup of your current httpd.conf file:
cp httpd.conf httpd.2001-12-20
And then replace it with the default:
cp httpd.conf.default httpd.conf
From there, try restarting the Apache webserver, and see what happens.