procedure EmptyRecycleBin;
const
SHERB_NOCONFIRMATION = $00000001;
SHERB_NOPROGRESSUI = $00000002;
SHERB_NOSOUND = $00000004;
type
TSHEmptyRecycleBin = function (Wnd: HWND;
LPCTSTR: PChar;
DWORD: Word): integer; stdcall;
var
SHEmptyRecycleBin: TSHEmptyRecycleBin;
LibHandle: THandle;
begin
LibHandle := LoadLibrary(PChar('Shell32.dll'));
if LibHandle <> 0 then
@SHEmptyRecycleBin := GetProcAddress(LibHandle, 'SHEmptyRecycleBinA')
else
begin
MessageDlg('Failed to load Shell32.dll.', mtError, [mbOK], 0);
Exit;
end;

if @SHEmptyRecycleBin <> nil then
SHEmptyRecycleBin(Application.Handle,
'',
SHERB_NOCONFIRMATION or
SHERB_NOPROGRESSUI or
SHERB_NOSOUND);

FreeLibrary(LibHandle);
@SHEmptyRecycleBin := nil;
end;