Zim - that was under the BROWSER settings, not the operating system.
I do not recommend any changes to the Windows Keyboard shortcuts at all - and tried to make that clear.
A quick look at search results indicates that attempting to mess with Windows 7,8,10 keyboard shortcuts is a nightmare - it is doable - but NOT by built in mechanisms - special software and programming ability is required for most of it.
http://answers.microsoft.com/en-us/windows/forum/windows_7-desktop/how-do-i-change-the-windows-7-keyboard-shortcuts/0110d32d-66c0-4ce7-8682-eeb896e80c3f?auth=1
http://msdn.microsoft.com/en-us/library/dd355407.aspx
Disabling Windows Keyboard Shortcuts
http://msdn.microsoft.com/en-us/library/aa460734(v=winembedded.5).aspx
http://www.sevenforums.com/tutorials/5937-windows-key-shortcuts-enable-disable.html
List for Windows 7: Shortcut Keys for Windows 7
http://www.sevenforums.com/tutorials/4052-shortcut-keys-windows-7-a.html