found this on another website, it worked a treat for me.....
"I am missing something here. You say you can manually maximize it, but can you manually
grab the edge of the window with your pointer to size it? In other words, if you
put your pointer on the bottom edge or bottom corner of your window, do you get the
double arrow that allows you to size the window?
Try this:
1. Launch IE. (If it's already open, close it down first and relaunch it.)
2. Right click on a link and choose "Open in New Window"
3. Close the first window
4. Resize the second window if you can. If not, maximize the second window.
5. Hold down the Ctrl and Shift keys and click the "X" at the top to close the window
IE should be completely shut down now. Relaunch it and see if it works."
Good luck