well, the first place to look is inside a phpinfo file.
create a file, put this in it:
<?php
phpinfo();
?>
upload it to somewhere in your web space, name it anything as long as it eneds in .php and I’ll take a look at it for you, if you like.
If you are uncomfortable with it being public, shoot me the link via email (whoo * village-idiot.org)
this is the problem, with that error:
the script loader file will throw it:
$scripts->add( 'wp-ajax-response', "/wp-includes/js/wp-ajax-response$suffix.js", array('jquery'), '20090128' );
$scripts->add_data( 'wp-ajax-response', 'group', 1 );
$scripts->localize( 'wp-ajax-response', 'wpAjax', array(
'noPerm' => __('You do not have permission to do that.'),
'broken' => __('An unidentified error has occurred.'),
'l10n_print_after' => 'try{convertEntities(wpAjax);}catch(e){};'
) );
and 2 other files:
wpAjax || { noPerm: 'You do not have permission to do that.', broken: 'An unidentified error has occurred.' } );
and
size()}},wpAjax||{noPerm:"You do not have permission to do that.",broken:"An unidentified error has occurred."});
you can see those arent especially useful error messages.
I take it youve tried other browsers? and that no other wordpress installs are working in this web space?