[kalisto]

Con este codigo puedes averiguar si el usuario logeado es admin.

Código Delphi [-]
unit WindowsUser;

interface
  uses Windows;

//returns True if the currently logged Windows user has Administrator rights
function IsWindowsAdmin: Boolean;

implementation

const
  SECURITY_NT_AUTHORITY: TSIDIdentifierAuthority = (Value: (0, 0, 0, 0, 0, 5)) ;

const
  SECURITY_BUILTIN_DOMAIN_RID = $00000020;
  DOMAIN_ALIAS_RID_ADMINS = $00000220;


function IsWindowsAdmin: Boolean;
var
  hAccessToken: THandle;
  ptgGroups: PTokenGroups;
  dwInfoBufferSize: DWORD;
  psidAdministrators: PSID;
  g: Integer;
  bSuccess: BOOL;
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(SECURITY_NT_AUTHORITY, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, psidAdministrators) ;

      for g := 0 to ptgGroups.GroupCount - 1 do
        if EqualSid(psidAdministrators, ptgGroups.Groups[g].Sid) then
        begin
          Result := True;
          Break;
        end;

      FreeSid(psidAdministrators) ;
    end;

    FreeMem(ptgGroups) ;
  end;
end;

end.