I need you to answer a few questions to solve your problem.
What happens when you lunch internet explorer i.e what is your present homepage ?
When did this problem start?
Ask can be dificult to remove.
Please try to set yahoo as your home page
First, navigate to the web page that you want to become your new home page.
ie. visit http://www.yahoo.com/
Click on the arrow to the right of the Home button, located on the far right hand side of your IE Tab Bar (encircled in red)
The Home Page drop-down menu should now be displayed. Select the option labeled Add or Change Home Page....
Select Use this webpage as your only home page
Let me know how it goes.