Add your Access database on the System DSN
(Windows Control Panel/ODBC Data Sources)
Then try testing this code snippet:
<?
$dsn = 'your_dsn';
$dbuser = '';
$dbpasswd = '';
$dbconn_id = odbc_connect($dsn, $dbuser, $dbpasswd);
$sql_cmd = "INSERT INTO table_name VALUES ('value1', 'value2', 'etc..')" ;
odbc_exec($dbconn_id, $sql_cmd);
echo "1 record inserted!<p>";
odbc_close($dbconn_id);
?>
Hope this helps!