To enable Alt-Tab through the Task Manager, you can try restarting Windows Explorer, as mentioned in the previous FAQ. If you suspect a device is causing conflicts with the Alt-Tab feature, you can uninstall it through the Device Manager. Press the Windows key + X, then select "Device Manager" from the menu. Locate the device in question, right-click on it, and choose "Uninstall device." After this, restart your computer to check if the Alt-Tab command is working correctly.