After deleting a vSwitch on my Hyper-V host (which runs on my Windows 10 64bit laptop), I was unable to recreate the vSwitch, as I wanted to change from using the Wireless Adapter to the Physical Network Adapter which would speed up my WSUS synchronizations time (using wired internet connectivity instead of WiFi).

Did some googling, and found that Microsoft had recommended running Easy Fix.
Source:
Solution:
- Download the executable, and run the executable.
- Follow the prompts.
- Ensure that you get the below screenshot indicated that the issue is fixed.

You should now be able to create your vSwitch.
Root Cause:
As per the article, the cause is because a new network setup functionality introduced in Windows 10 doesn’t completely delete all objects from the previous vSwitch installation. This problem is scheduled to be fixed in the next Windows 10 update.



