Recent Microsoft update changed my IE window size. How to fix?

We received an automatic update the other day that messed up our computer and we haven't been able to find a fix. Even when the window size is expanded to fit our nice wide flatscreen monitor, the outer edges are white while the body of the window occupies only about the middle 3rd of the screen. The font is really small also, and only tries to cram all the larger info into the smaller space when we enlarge the font. The only exception is when you click on an ebay item, then the auction details spread to fill the entire screen with a normal size font. What the heck? Did this happen to anyone else? How do I fix it? Many thanks!