Mengubah wallpaper dan mematikan screensaver dengan memanipulasi registry

uses registry;
procedure TForm1.FormCreate(Sender: TObject) ;
var
reg:TRegistry;
begin
reg:=TRegistry.Create;
with reg do begin
try
if OpenKey('\Control Panel\desktop', False) then begin
//change wallpaper and tile it
reg.WriteString ('Wallpaper','c:\windows\CIRCLES.bmp') ;
reg.WriteString ('TileWallpaper','1') ;
//disable screen saver//('0'=disable, '1'=enable)
reg.WriteString('ScreenSaveActive','0') ;
//update changes immediately
SystemParametersInfo (SPI_SETDESKWALLPAPER,0, nil,SPIF_SENDWININICHANGE) ;
SystemParametersInfo (SPI_SETSCREENSAVEACTIVE,0, nil,SPIF_SENDWININICHANGE) ;
end
finally
reg.Free;
end;
end;
end;