Seems like you have been hijacked. Run a highjack this log. For help in finding out what to do you can post the log over at www.equorial.com and a tech will look at it and help you get rid of the nasty stuff.
I'm fairly new to computers so bear with me. When I go to Microsoft internet explorer instead of the top tool bar it changed to Monster tool bar and it says to click here to change tool bar back. How do I stop this Monster? thanks