Recommendation of Windows Clients

Hello everyone, I am a new PHP user working on winxp with apache and mysql. I have tested some php develpment environments, but none of them seem to really work well. None of them, for example, are able to debug multiple scripts in sequence, as, for example, when there is a php or html form that requests a php script. I would like recommendations about what environment. I have tried, Maguma, Zend, and PHPED. Their trial, but according to the manufacturers, completely functional versions. Thanks, Guillermo