Просто воспользуйте следующим кодом:

function GetWinVersion: String; 
var 
   VersionInfo : TOSVersionInfo; 
   OSName      : String; 
begin 
   // устанавливаем размер записи
   VersionInfo.dwOSVersionInfoSize := SizeOf( TOSVersionInfo ); 
 
   if Windows.GetVersionEx( VersionInfo ) then 
      begin 
         with VersionInfo do 
         begin 
            case dwPlatformId of 
               VER_PLATFORM_WIN32s   : OSName := 'Win32s'; 
               VER_PLATFORM_WIN32_WINDOWS : OSName := 'Windows 95'; 
               VER_PLATFORM_WIN32_NT      : OSName := 'Windows NT'; 
            end; // case dwPlatformId 
            Result := OSName + ' Version ' + IntToStr( dwMajorVersion ) + '.' + IntToStr( dwMinorVersion ) + 
                      #13#10' (Build ' + IntToStr( dwBuildNumber ) + ': ' + szCSDVersion + ')'; 
         end; // with VersionInfo 
      end // if GetVersionEx 
   else 
      Result := ''; 
end; 
 
procedure ShutDown; 
const 
  SE_SHUTDOWN_NAME = 'SeShutdownPrivilege';   // Borland forgot this declaration 
var 
  hToken       : THandle; 
  tkp          : TTokenPrivileges; 
  tkpo         : TTokenPrivileges; 
  zero         : DWORD; 
begin 
  if Pos( 'Windows NT', GetWinVersion) = 1  then // we've got to do a whole buch of things 
     begin 
        zero := 0; 
        if not OpenProcessToken( GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES or TOKEN_QUERY, hToken) then 
           begin 
             MessageBox( 0, 'Exit Error', 'OpenProcessToken() Failed', MB_OK ); 
             Exit; 
           end; // if not OpenProcessToken( GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES or TOKEN_QUERY, hToken) 
        if not OpenProcessToken( GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES or TOKEN_QUERY, hToken) then 
           begin 
             MessageBox( 0, 'Exit Error', 'OpenProcessToken() Failed', MB_OK ); 
             Exit; 
           end; // if not OpenProcessToken( GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES or TOKEN_QUERY, hToken) 
 
 
        // SE_SHUTDOWN_NAME 
        if not LookupPrivilegeValue( nil, 'SeShutdownPrivilege' , tkp.Privileges[ 0 ].Luid ) then 
           begin 
              MessageBox( 0, 'Exit Error', 'LookupPrivilegeValue() Failed', MB_OK ); 
              Exit; 
           end; // if not LookupPrivilegeValue( nil, 'SeShutdownPrivilege' , tkp.Privileges[0].Luid ) 
        tkp.PrivilegeCount := 1; 
        tkp.Privileges[ 0 ].Attributes := SE_PRIVILEGE_ENABLED; 
 
        AdjustTokenPrivileges( hToken, False, tkp, SizeOf( TTokenPrivileges ), tkpo, zero ); 
        if Boolean( GetLastError() ) then 
           begin 
              MessageBox( 0, 'Exit Error', 'AdjustTokenPrivileges() Failed', MB_OK ); 
              Exit; 
           end // if Boolean( GetLastError() ) 
        else 
           ExitWindowsEx( EWX_FORCE or EWX_SHUTDOWN, 0 ); 
      end // if OSVersion = 'Windows NT' 
   else 
      begin // just shut the machine down 
        ExitWindowsEx( EWX_FORCE or EWX_SHUTDOWN, 0 ); 
      end; // else 
end;