The same three websites keep opening on their own, either when I use the internet, and help to stop this?

one of the websites is http://77.93.75.150/dot.gif/?ver=112&cmp=profiling4&uid=52C493FEDEBB11DDB096166350CFFFFF&guid=EC7B54672B1C4B218AEB85D6AFECA28C&affid=166350&rid=zdez&m=irq4&revid=9884&lid=search.yahoo.com%2Fsearch%3B_ylt=A0geu8.7I2hJxhABVK1XNyoA%3Ffr2=sg-gac%26sado=1%26p=how%20to%20turn%20on%20microsoft%20firewall%26fr=yfp-t-501%26ei=UTF-8&uqs=31&s=0&c1=31&c2=0&uid_track=2d4eec22-a4ba-4eba-8b7d-410511f80598&br=firefox