The real question here is "what is the issue that XP has that keeps Apache from displaying PHP pages?"

I have tried PHP 4.3.8 and 5.0.1 with the same problem.

Does anyone have any information on issues with XP Home that keeps Apache from recognizing PHP pages?

This may or may not help you. I thought I had the same problem. When I would go to my Test directory and click on one of my PHP files, it wouldn't display properly. Then I realized the problem was that I had to use the correct structure of http://localhost (etc.)

Does that help?