I want to prevent **Windows XP** from powering down as long as my **Delphi** app is running, and I tried the following: 

```
procedure TForm1.FormCreate(Sender: TObject);
begin
  SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, 0, nil, 0);
  SystemParametersInfo(SPI_SETPOWEROFFACTIVE, 0, nil, 0);
  SystemParametersInfo(SPI_SETLOWPOWERACTIVE, 0, nil, 0);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, 1, nil, 0);
  SystemParametersInfo(SPI_SETPOWEROFFACTIVE, 1, nil, 0);
  SystemParametersInfo(SPI_SETLOWPOWERACTIVE, 1, nil, 0);
end;

```

but that doesn't seem to work. Other suggestions anyone?  

TIA  

Steven