Safari automatically opens unwanted website in extra tab
Hello,
whenever I start Safari there's an unwanted tab opening next to my home tab (home tab = apple homepage), in this extra tab showing the URL www.yippy.com -> a search engine.
I already did:
x) reset Safari
x) delete internet history
x) delete browser cache
x) delete cookies manually
x) system scan with Kaspersky
But then I quit Safari, restart it, and there it is again: the search engine in its tab opening and setting a cookie.
I have no idea what to do now... but I definitely don't want to be forced to use this website or close it whenever I start Safari.
Please heeeeeelp!
Thank you
Sophie
MacBook Pro, OS X Mountain Lion (10.8.2), Safari Version 6.0.2 (8536.26.17)