Normally VPNS make their own virtual adapter. TunnelBear is a VPN.
Either try to uninstall TunnelBear or check to make sure your internet connection is actually plugged in. You should be seeing two Adapters. One for local LAN and the TunnelBear for VPN use.
If you are not, there might be an issue with your NIC. Try to reinstall NIC drivers and test the cable etc... if all else fails. Try a new NIC.