Prevent Windows Key from Opening Start Menu in Windows 7
Here is the solution: http://www.autohotkey.com/forum/topic55858.html
Use the following code in AutoHotKey:
~LWin Up:: return
~RWin Up:: return
The following AutoHotkey script will disable the ⊞ Win key activating the start menu for both left and right ⊞ Win keys in Windows 10.
LWin & vk07::return
LWin::return
RWin & vk07::return
RWin::return
If you also follow the instructions here, you can disable most of the other ⊞ Win key shortcut combinations:
Method 1: Disable Win + keyboard shortcuts in Windows 10 through Group Policy Editor
I'm still trying to figure out the best way to disable ⊞ Win+Tab ↹ and ⊞ Win+L functionality. I'll come back and edit this if/when I do.
This worked for me on Windows 8, while the current answer did not:
LWin & vk07::return
LWin::return
Source