Getting Yahoo search results When Typing into Googl Address bar

I don't know why I am getting Yahoo results when I type into Googl's address bar. It no longer gives me Google Results.

Google is my default search in that I typed in the Google search bar google.com/google.reg

I use to have Google in my address bar and got Google results , but now it's Yahoo's search results fromm the address bar.

How do I get Google back into the address bar search ?

I use to type a word into firefox address bar and it would automatically add http://www. whatever , and go without my clicking the "GO" button. and it gave me google results. but it no longer does. I have to type it in. When I just type a word into Google address bar , it gives the results fromm Yahoo.

Please help. I want Google back into my address bar.

Thanks

 

Has no one read this ? Please , surely someone can respond to my post. There are a whole lot of posters here. I really do want to clear this problem up and would be very grateful for a solution.

Thanks

 

Thank you Tech Support Guys so much for your assistance on this problem.