I'm not sure blocking a website wi help, but perhaps complaining will... (see below)
what exatly is happeneing?
is someone on the machine that is a web server hacking you, or is there a program on your machine posting data to a webserver?
% This is the RIPE Whois query server #2.
% The objects are in RPSL format.
% Rights restricted by copyright.
% See http://www.ripe.net/db/copyright.html
inetnum: 188.8.131.52 - 184.108.40.206
descr: UK Internet Provider
descr: Please address AUP complaints to email@example.com
descr: or phone +44 (0)870 1995 108.
descr: Complaints are dealt with in line with
descr: Portland Communications AUP immediately.
status: ASSIGNED PA
changed: firstname.lastname@example.org 20041030
descr: CSI Telehouse Network
descr: Please address abuse complaints to email@example.com
descr: Where they will be dealt with in line with our AUP.
descr: Abuse complaints to any other address will be ignore.
changed: firstname.lastname@example.org 20001119
person: Gary Shine
address: Netlink Solutions Limited.
address: 1661 Spring House Trail
address: Virginia Beach
address: Virginia 23455 U.S.A
phone: +1 757 460 3555
fax-no: +1 757 460 7759
changed: email@example.com 20011021