Forum Moderators: open
C:\WINNT\system32\drivers\etc\hosts
(If its not there, do a search on files named hosts)
Entries will be like this
127.0.0.1 localhost
127.0.0.1 www.example.com
127.0.0.1 example.com
etc.
You will need to edit the file to remove the offending site's entry.