description of feature:
http://windows.microsoft.com/en-US/windows7/products/features/shake

1. Type gpedit.msc in RUN or Start Menu Searchbox and press Enter. It'll open Group Policy Editor.

2. Now navigate to:

User Configuration -> Administrative Templates -> Desktop

3. In right-side pane, double-click on "Turn off Aero Shake window minimizing mouse gesture" option and set its value to "Enabled".


alternate method:

Browse to the following key:

HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Explorer
(the Explorer key may not be there by default, just create it)

Make a 32-bit DWORD called "NoWindowMinimizingShortcuts".

Set the value to 1.