adodb.inc.php连接MSSQL2000错误

include("adodb.inc.php");
$db =& NewADOConnection('mssql');
$db->Connect("127.0.0.1", "sa", "sa", "syoa");
$result = $db->Execute("SELECT * FROM USER");
if ($result === false)
{
die("查询失败！");
}
while (!$result->EOF)
{
echo $result->fields[0];
$result->MoveNext();
}
$db->Close();一片空白,没有数据显示,大家帮看下那里出错了