How to stop Ld-Finde.com defaults when I try to use GOOGLE Search

PLEASE HELP, I am constantly getting sent to Ld-finde.com - I do not have this issue in any IE browser... if this continues, I will no longer use FIREFOX... too much of a pain .... I need to use GOOGLE or YAHOO Search... I do not nor authorized Ld-finde.com == URL of affected sites == http://www.google.com