function IsAdmin: Boolean;
const
  SECURITY_BUILTIN_DOMAIN_RID=32;
  DOMAIN_ALIAS_RID_ADMINS =544;
var
  hAccessToken: THandle;
  ptgGroups: PTokenGroups;
  dwInfoBufferSize: DWORD;
  sid: PSID;
  x: Integer;
  bSuccess: BOOL;
  sia:TSIDIdentifierAuthority;
begin
  Result := False;
  bSuccess := OpenThreadToken(GetCurrentThread, TOKEN_QUERY, True, hAccessToken);
  if not bSuccess then
  begin
    if GetLastError = ERROR_NO_TOKEN then
      bSuccess := OpenProcessToken(GetCurrentProcess, TOKEN_QUERY, hAccessToken);
  end;
  if bSuccess then
  begin
    GetMem(ptgGroups, 1024);
    bSuccess := GetTokenInformation(hAccessToken,TokenGroups, ptgGroups, 1024, dwInfoBufferSize);
    CloseHandle(hAccessToken);
    if bSuccess then
    begin
      AllocateAndInitializeSid(_SID_IDENTIFIER_AUTHORITY(sia), 2,
           SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS,0, 0, 0, 0, 0, 0, sid) ;
      {$R-}
      for x := 0 to ptgGroups.GroupCount-1 do begin
        if EqualSid(sid, ptgGroups.Groups[x].Sid) then
        begin
          Result := True;
          Break;
        end;
      end;
      {$R+}
      FreeSid(sid);
    end;
    FreeMem(ptgGroups);
  end;
end;

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