How to remove hidden devices

Have you ever encountered a situation like this!

If you have a NIC installed in one PCI slot and you moved it to another PCI slot in the same computer, when you still try to the same IP this message will appear. So, how can we make this message go away? Uninstall that hidden NIC, of course! But how? I googled it and found an instruction, which I think explain better. The link is http://www.tech-recipes.com/rx/504/how-to-uninstall-hidden-devices-drivers-and-services/

Open a command prompt, and type set devmgr_show_nonpresent_devices=1, enter, then type devmgmt.msc to execute device manager console.

In device manager, click View>Show hidden devices

Note: If you just open device manager without setting set devmgr_show_nonpresent_devices=1, you can still choose [show hidden devices]. However, you won't be able see devices uplugged as shown below.

The hidden devices are grayed out

Select the one you want to remove and click uninstall button