Windows 7 Switch User Disabled Or Greyed Out
If this option is disabled or greyed out on your Windows 7 system, there are a couple of things you can do to fix it. If you are on a domain and want to be able to use fast user switching, you can, but you have to edit Group Policy. Depending on your company, you may or may not be able to do that. Also note that you cannot edit this fast user switching option via the GUI anymore in Windows 7....