Use Hijackthis and remove the Individual entries for the poster in question See your own post below
Now Download SuperAntispyware Free http://www.superantispyware.com/download.html and MalwareBytes AntiMalware http://www.malwarebytes.org/mbam.php
Install, Update them and then do a Full Scan in Safe Mode.
Now Download http://www.funkytoad.com/index.php?option=com_content&view=article&id=13&Itemid=31
Unzip HostsXpert.zip
It will create a folder named HostsXpert in whatever folder you extract it to.
Run HostsXpert.exe by double clicking on it.
Click the Make Writeable? button.
Click Restore Microsoft's Hosts File and then click OK.
Click the X to exit the program
Quads