thanks, it was a long process changing the search engine was fine for one tab, as long as you didn't open another tab yahoo was still there lucking. i down loaded the malwarebytes and it found files!!! so i deleted them. eventually with more fiddling i've got chrome and google how i want them.
how do i know and check that i've removed every last bit (thats a bad pun! ) of yahoo??
this started when i downloaded VUZE , which wasn't what i really needed 🙁(
the vuze programmer needs a good shake.....