Plug-in Activate Error: Site is blank

Running WP 2.04, I was about to activate a plug-in named FEED-LIST. when i clicked on ACTIVATE the page updated and then became blank. the entire site blanked out. even the admin log-in page seems to have disappeared. all the files are on the server, nothing deleted, and all the correct data is still in the database, but i cannot access the site. I refreshed my browser, tried from other browsers and other machines, still nothing. the URL is http://www.wisoa.com/site/.

Has anyone had this problem, or do I have gremlins?