When I open I.E. it takes me to my Yahoo home page. I begin to get numerous Object Error pop up windows that I cannot clear. I have to close the program by ending the task to exit. Yahoo home page works fine with Mozilla.

What version of internet explorer are you using...because anything other than version 8 is going to struggle on today's web standards. You can identify what version of IE you are running by pressing "ALT", going to "Help" and selecting "About internet explorer".
You can download the latest version of internet explorer by using windows update, or manually from Microsoft.
If you are already running IE8 then you could try an IE Reset:
Tools > Internet Options > Advanced tab > Reset button.You will lose most add-ons and a few of your settings but most can be sorted out or will come back eventually with use.
Always pop back and let us know the outcome - thanks
