Installing php5 on Vista home edition?

Anyone known how to do this, I have tried a few web site tutorials and with no luck! I just get the HTTP Error 500.0 internal server error message. I have did that whole mapping thing to but I just get this error message after doing the whole c:\PHP\php5isapi.dll exectuable path thing “one or more of teh modules specified for this handerl does not exist in the modules list. if you are trying to add a script map to the IsapiModule or the cgimodule is present in the module list” Okay but where and how do I add it to the module list?

Please help I would really like to start using PHP5 on vista