Can you be a little more specific about what shortcuts? A lot of key combination's are stored within the application you are running. i.e. Shift+Tab Ctrl+Shift+Tab in mozilla to navigate open tabs. These are generally disabled/enabled in the options of the program or through add-ons in the Firefox case.
If they are windows shortcuts see the following:http://support.microsoft.com/?id=216893
Usual warning's for editing the registry apply, back-up the registry before you make changes.
If they are function combination's its likely the companies software bundled with the machine.