On a computer that is running Windows 8.1, Windows 8, or Windows 7, when you install, remove, and then reinstall two versions of a network driver to the same device, it can cause the device name to have a number (such as "#2" or "#3") after the name in Device Manager, even though a single device is installed.
The following picture shows an example:
A hotfix is available that prevents the duplicate friendly name issue from occurring, but the hotfix must be installed before the new version of the driver is installed. The link for this hotfix is available at the following Microsoft website:
2846340 Duplicate friendly names of network adapters are displayed in Windows
Note This hotfix does not apply to Windows 8.1.
This occurs because of the way that Windows builds the friendly name for the device. It does not affect the functionality of the device.