IMHO, using canned programs like you're doing leads to frustrations like you're experiencing. If there is a problem with WAMP, XAMPP, yadda-yadda, the best thing you can do is to use their forum as others have likely had the same problem. When they use different file structures, there's no way to really help other than recommend that you look for the CREATOR's (Apache.org, PHP.net, etc) file structure for the named file and then SEARCH for it.
That or follow Kevin Yank's directions in the FREE Chapter One of his first book and install each daemon with the latest and greatest (stable versions) of the software. This is what I do and have never had a problem (of course, my first step was to STOP IIS then edit its properties to prevent autostart - I ONLY want Apache and I want it ON port 80).