Shut down and Restart and the Windows API

Hi group,

Not too sure whether I am in the right group. If not, please point me in the
right direction.

I need to shutdown and restart the PC in a Delphi 7 app. I have written. I
have tried using two Windows API calls, neither of which seem to work:

      ExitWindowsEx(EWX_FORCE+EWX_LOGOFF+EWX_REBOOT,0);
      InitiateSystemShutdown(PChar(''),PChar(''),0,True,True)

Neither have any effect. My development PC is running Windows Xp
Professoinal.

What am I missing?

Regards,
Morpheus