How to remove Windows 10 virtual machine after hardware change

I have a Macbook Pro and have been running a Windows 10 virtual machine in Parallels 11. Last week I had to replace the motherboard of the Macbook, with the result that I now have to reactivate/reinstall Parallels and Windows 10. I succeeded in reactivating Parallels 11 without difficulty using the Product Key, but I have problems with Windows 10. The version I have on the machine will not boot. I was advised on a Microsoft community forum to reinstall Windows 10, and I succeeded in downloading a new version of Windows 10 using the old product key I had for my original Windows 7. That means that I now have two Windows 10 virtual machines running. But the new Windows 10 is not activated, and it seems that I cannot activate it until I have removed the unbootable Windows 10.

Can someone tell me how to do that, please? It is probably very simple, but I am not very "techy"!

 

Thanks PaulChris for your reply. But do I not need to get rid of the "old" unbootable Windows 10 before I try to activate the "new" Windows 10 I downloaded yesterday (and which appears as 10 1 in my system)?

 

Hi, it's up to you. If you don't need to use "old" Windows VM you can remove it and install new one without any issue.

 

Thanks, Maria, that's great. But I need help in removing it. As I said above, it is probably very easy, but I'm a bit thick and cannot see what to do!

 

Following Maria's post I managed to delete the unwanted Windows 10 virtual machine. I have then tried to activate the newly downloaded Windows 10 virtual machine using the article that you pointed me to, but I cannot understand what I have to do, it is not very clear. One problem I have is that my Windows 10 screen does not have the command bar at the bottom with the Start button. So I have not been able to bring up the Run as Administrator command. Also, I do not understand what is meant by the "slmgr -ipk xxxx-xxxx-xxxx-xxxx-xxxx" thing. Am I supposed to put the old Windows 7 activation key in that? But at the moment I vcannot even get that far. And the further Microsoft article that is linked to the Parallels one is far too complex for someone like me. It is for a developer rather than a user.
I confess I am getting very fed up with this, I have been trying to sort it out for 2 days without success, and I do not see why it should be so complicated.