When I tried loading the Acid Tests websites in IE2 (from the utilu collection on XP SP2) it gave me the error "Site Temporarily Unavailable (error id: 'bad_httpd_conf')". Not sure what's up.
As he said in the video, IE1/2 don't send a hosts header with their request and thus can't access most sites, ACID included. You'll have to download the test and all necessary files to a local disk in order to run it.