Isapi_Rewrite is installed on all our Windows servers.
Version 2 is installed on servers HNODE2, HNODE3 and VPS5 and needs an httpd.ini file in the root folder (wwwroot) of the domain
http://www.isapirewrite.com/docs/
Version 3 is installed on servers HNODE7, VNODE1, VNODE2, VNODE8, VNODE9 and VNODE10 and needs a .htaccess file in the root folder (wwwroot) of the domain
http://www.helicontech.com/isapi_rewrite/doc/
You can find which server your domain is hosted on under "Website Settings" for the domain in Helm
Email any time or call 01480 26 00 00 014 80 26 00 00