Admin page throwing error

I’ve installed WordPress and the site works correctly, but the admin page does not. I get the following error:

Warning: require_once(./wp-load.php) [function.require-once]: failed to open stream: No such file or directory in ./admin.php on line 30

Fatal error: require_once() [function.require]: Failed opening required './wp-load.php' (include_path='.:/usr/local/pear') in ./admin.php on line 30

I’ve seen where people say to add the ‘.’ to the /wp-load.php line in admin, and that works until I need to run a plugin, then I get a separate error.

Anyone know what is causing this?