Visual Editor problems

Hi,

I’m trying to update one of the pages on my website, but it won’t let me use the visual editor. I’m not good with using coded language (!) so can’t update at the moment. I click on ‘Visual’ but nothing happens. This happens on every page.
I’ve noticed the following message – “Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 122880 bytes) in /home/noteperf/public_html/wp-admin/includes/class-wp-comments-list-table.php on line 403” in the comments box underneath the page edit area.

Any help would be gratefully recieved!