every time I try to install php on windows I get a file called php-5.4.8.tar.bz2 I dont know how to install this kind of file can someone help me?
You're using the wrong file, you're on Windows not Unix!
This should help:
yet, use a wamp server, it's simple and easy to use. enjoy your PHP trip ! :)
In case you're looking for a place to start learning PHP, I highly suggest this simple tutorial:
It's a very straight forward tutorial that'll get you started with PHP in no time!