Local php issue/ Win 2000 Pro / Apache server local up / php webhosting(external) ok / php local (on my PC) displays as pure HTML

Hi, I have this small(!?) issue with php, on which I got very intrested just recently. I'm running Windows 2000 Pro, Apache server (WAMP5), which works well btw. I can make php scripts, but can't see them locally in my browser. If I put them in my browser(through local apache) they just show up as html language. If I upload them on my free webserver, I can see them, but I can't test them locally which isn't a BIG problem for me, but an annoyance which when solved could spare me some time... First I just installed it my way (webserver), not ok, than I uninstalled/rebooted/reinstalled it your way, ie http://www.php.net/manual/en/install.windows.php (ISS 4 or higher), same issue... I'm using the the php4 package, am I advised to install the php5 one? I rather experiment with a stable version, before moving on... If someone could solve this small issue I'd be happier with some more available php crusing ^^ kind regards, Jan Van Damme.