Are you using Windows 7?
Try playing around with this;
1. Type ALT + Spacebar
2. Click on Size
3. Press the right arrow key (or the key that "points to" the window border that is off the screen): the cursor should jump to that window border
4. Press the left arrow key (or the opposite of whatever key you pressed in the previous step) to resize the window: the edge of the window should move in the direction you've chosen.
5. Press Enter when done resizing.