Amarth

I'm having some kind of issue with my explorer. The problem appears to be some kind of virus that has infected the search bar. A max of two times, once when I start explorer and once a little while after I've been on, I will suddenly experience a popup ad that takes up the entire screen. If I press any key, it says please wait while document finishes loading. So, I just hold alt which brings up that little thing and press f4 three times and it'll close. When I close it, my search window on the explorer has been opened and the place where you type what you're searching for is gone and replaced by:

[object]

just like that. Anyone know what the problem is... or more importantly... how to get rid of it?