When a VM has done its job and it is time to say “c’est la vie” to it, getting rid of it completely may not be as cut and dry as you think.
First off, delete it from your Hyper-V Manager. To do this, open Hyper-V Manager
Right click the VM you want to remove and click Delete.
Click Delete once more.
The Status column for that VM will show you Hyper-V Manager’s progress.
This only removed the VM from that Hyper-V Manager. It did not delete the VMs files. This could be both a good, and a bad thing. The good thing is that you an always port this VM to another Hyper-V host or back into the original one. The bad news is that it is still consuming your hard drive space. If you truly want to get rid of this VM, browse to the location where it was stored and delete the parent folder.