Rob Sbaglia on "[Plugin: W3 Total Cache] Can no longer access blog"

I installed WP3 total cache on my community blog, http://theglobalschool.net/writersclub and the whole site has fallen over. I can no longer access the site at all. Can someone help please? I have deleted the plugin folder and associated files, to no avail.
Cheers,
Rob.

http://wordpress.org/extend/plugins/w3-total-cache/