If you've set php up correctly for apache, the dos window should show
Apache/1.3.27 <win32> php/4.3.1 running...
Version numbers will vary.
If you've got that then your root directory is set in either php.ini or the httpd.conf (or whatever it's called, I forget now). Usually it's under the apache directory somewhere, but you can alter this to whatever you want. I have mine under c:\php\www Once you make a change to the files, you must restart apache for the changes to be made.