chebolsk got it right but there is one key information missing: You *must* modify the system path so that the path to your php installation is included! (actually this piece of info is listed on the php installation page somewhere but they fail to stress just how important this is).
You can modify the path in Windows by right clicking My Computer, and under the Advanced tab modify the Path environment variable. Just append the php installation directory. Reboot the pc (yes I’m serious). After that you should have no problems.
WordPress famous 5-minute install .. OH YEAH. Just remember the 2 hour install of Apache and php that is a prerequisite. I love computers.
