no output from php

Please help with this problem: I've installed php 4.3.1 on windows 2000 with Apache 2. There is a php application on the server which runs fine with the server. Then I tried to install phpMyAdmin but cannot get any output from any script except those belonging to the abovesaid application. So, php is installed and running, but does not output anything with any scripts outside of the main application path. A test script in c:\ce\www\test.php runs fine at the address http://localhost/ce/test.php with "/ce/" as an alias for "c:\ce\www\" The same test script at c:\Programme\Apache Group\Apache 2\htdocs\test.php with the address http://localhost/test.php does not produce any output. Nor any error message in the logs. Running the same script in the php directory in CGI mode, i.e. with php -f test.php does not produce any output either except the http headers. Could there be a problem with long filenames? Or where am I supposed to search for the error? Thanks for any help.