Problem with: exec(), system()

I don´t know whats the problem with exex, system :( first time i get: error message: Warning: Unable to fork [C:\winnt\system32\cmd.exe dir C:\] in c:/program files/apache group/apache/htdocs/relay/relay.php4 on line 28 when second time, it hangs, i dont get any response from the server. i have to restart Apache to get the error msg again. using: Apache 1.3.14 on WinNT 4.0 PHP Version 4.0.4pl1 code: <?php print("Hello world!<BR>\n"); $cmd = "C:\\winnt\\system32\\cmd.exe dir C:\\"; /* for test, want to use c:\\test\\test.exe, but gets the same errors */ $hmm = system( $cmd ); ?> Thanks for help. -- Regards Johan