include path in php.ini

Hi Sorry if this is a real dumb question but .... I have apache installed in c:\program files\apache group\apache on windows. I have set up an include directory in .... apache\php Howerver if I set the include path in php.in as c:\program files\apache group\apache\php it fails. I know this is very basic, but so much of the instructions relate to unix or leave me guessing as to what the first part of the path should be! Thanks in anticipation Sara