Cannot remove HyperV vEthernet (Default Switch)

  1. Use the Hyper-V management console or Device Manager aka. devmgmt.msc to remove virtual NIC. Do not remove NIC via registries

  2. You remove virtual switch via PowerShell like it's specified here: https://www.starwindsoftware.com/blog/basic-hyper-v-virtual-nic-management

  3. Also as a workaround, you can try these steps. https://social.technet.microsoft.com/Forums/windows/en-US/e49df568-4f4c-47b7-b30c-952d1e26ca58/cant-remove-failed-virtual-switch-from-hypervs-virtual-switch-manager