If you don't see rounded corners at each corner of your window, it is probably outside the screen area, Move with "Alt+Spacebar".

You may not see those buttons clearly if they get hidden by the transparency on Windows 7.

Right click in a free space on your desktop.
Left click on Personalization.
There are four options in Windows 7 at the bottom of the screen, choose "Window Color and Appearance".
Select a border color
Uncheck: "Enable transparency"

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