When I press left and right mouse button at the same time, windows 7 arranges all windows in 3d space diagonally for me to pick one. I don't know what it's called.
Any idea on how to disable it?
It sounds like you have a 3rd-party or a mouse manufacturer program that had remapped the combo mouse clicks to Windows Flip 3D (Windows Key + Tab). To solve such problem, you need to locate the program and removed the mapping.
If you would like to disable Flip 3D completely then follow the instructions below. Note that this doesn't "technically" solve the mapping issue. However, since it does disable the Windows feature, it will prevent your game from being minimize when clicking the two mouse buttons at the same time.
How to Disable Windows Flip 3D Completely via Registry - Windows 7
This is the way to do it without downloading anything. The steps are in detail steps to help both experienced and non-experienced users.
Disclaimer : You should always backup your registry before editing your registry.
The feature seems to be called
It seems that the key combination has been tied to the mouse actions probably with some preinstalled software as this is not enable in Windows by default.
However I found a solution to disable the feature, albeit a bit overkill but it should work.