There's so many of these sites that claim your computer is infested with malware.
locks up your screen and says "http://http.ixfo021.tk
is requesting your username and password. The site says: This url has been blocked under the instruction of a competent Us government authority or in compliance with the orders of a Court of competent jurisdict..."
p.s there's a site called http://transcom.co.uk/category/bad-domains/
that's just completely copying all the info on this site and making it look like theirs