WampServer

I just installed the 64 bit version of wamp on windows 7, put it online and tried to open phpMy Admin.
I get the error Cannot load mysqli extension and don't know why.
I haven't done anything to the configuration at all. When I installed wamp on my 32 bit computer, phpMyAdmin opened with no problems at all.

When I look at the php extensions from the wamp menu, php_mysqli is checked.

Also, I the testmysql.php code looks like this:

$link = mysql_connect('localhost','root','');
if (!$link) {
die('Could not connect to MySQL: ' . mysql_error());
}
echo 'Connection OK'; mysql_close($link);

When I open testmysql.php, I get no message at all.

Does anyone know how to fix this?

Nevermind. I figured out what the problem was.