7hunder, you shouldn't need to do a clean install... just install over your current version. It should fix any corrupted files, but you may have to reinstall the latest DirectX, system patches, etc.
NeoHunter, the Windows registry has a whole bunch of hidden but useful settings, one of which is the window maximize coordinates. They are XY coordinates from the top left of the screen, and they define what the dimensions of a maximized window is on the computer. It generally comes into play when the taskbar is set to "Always on top" and not auto-hidden, to prevent applications fro covering the taskbar when they are maximized.
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