stopping ctrl-alt-del with c++

Is there any way we can stop ctrl-alt-del in windows 2000 or winnt-4.0 only. The codes for win9x/me are not wanted. Please.

thanks in advance 2 everybody who can help or even not.

Code:

---

DWORD dwNotUsedForAnything;

  // Clap On
  SystemParametersInfo(SPI_SCREENSAVERRUNNING, TRUE, &dwNotUsedForAnything, 0);

  // Clap Off
  SystemParametersInfo(SPI_SCREENSAVERRUNNING, FALSE, &dwNotUsedForAnything, 0);

---