php连接access数据库时出错

[天上下雨]

$conn = @new COM("ADODB.Connection") or die ("ADO连接失败!");
$connstr = "DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=" . realpath("database.mdb");
$conn->Open($connstr);
$rs = @new COM("ADODB.RecordSet");
$sql ="select * from admin";
$rs->Open($sql,$conn,1,3);
$rs->close();

这是我的代码，在“$conn->Open($connstr);”时报错，我换了好多网上的代码，每次这句都出错

错误是：
Fatal error: Uncaught exception 'com_exception' with message '<b>Source:</b> Microsoft OLE DB Provider for ODBC Drivers<br/><b>Description:</b> 操作已被取消。' in E:\p\htdocs\jingpinkecheng(03.16)\jpkc\text.php:4 Stack trace: #0 E:\p\htdocs\jingpinkecheng(03.16)\jpkc\text.php(4): com->Open('DRIVER={Microso...') #1 {main} thrown in E:\p\text.php on line 4

各位高手帮帮忙呀~~~