Please follow the steps to remove IP6 entry and the adapter.

1. Open Start Menu
2. Type In: Device Manager
3. Select Device Manager
4. Click the View menu from the top
5. Select Show Hidden Devices (Must be check before continuing)
6. Scroll down and expand Network Adapters
7. Right-Click a duplicated Microsoft 6to4 Adapter or Microsoft ISATAP Adapter
8. Select Uninstall
9. Click OK for the pop-up warning message
10. Repeat and repeat for each of the unwanted duplicated adapter
11. Close Device Manager when finish