Well, in Theory it is simple. You have to delete the Windows Partition and the Recovery Partition and then add this free Disk Space to Your Zorin Partition. And this Adding could be difficult.
Then You have to delete the Windows Boot Entry. But that you could do with Nautilus.
Oh okay 
so complicated after all 
I mean, You could try it. Before You do it, save Your Data and make a Back Up. In worst Case, You could then install Zorin new and use the Back Up.
Delete the Windows Boot Entry isn't too complicated. First You should install a Package called ''nautilus-admin''. It is a Package with that You can use Nautilus with higher Permissions. To say it clear: It is no extra Program; it is an Addition for Nautilus. so, you don't find an Icon for it like with an installed Program. To install it type in the Terminal sudo apt install nautilus-admin
After that open Nautilus and go on the left Side to ''Other Places''. Then look at the left side and choose the first Option:
Then You go in the boot Folder and then in the efi Folder. When You do that, you have to type in 2 Times Your Password for Operations. Then You should see this:
There You go in the EFI Folder:
There You should delete the ''Microsoft'' Folder. Only this one!
To delete the Partitons, put Zorin on a USB Stick and start it in the Try Mode. Then use GParted and open it. Then You have to look that You delete and format the Windows System and Recovery Partitions. And when they are free, you must add the free Space to the Zorin Partiton. In Theory this is easy but in Practise it can happen that it simply not work. But when You want try it, it is up to You.
Many thanks for the instructions. 
This is something for bad weather days, we'll see when I get around to it. 
No longer runs Windows, only Zorin 17.1 Pro.
I'm done with Microsoft and look forward to many good years with Zorin 
You did a fresh Install or deleted the Windows Stuff manually?
First I removed Windows according to your instructions. This also worked , but I was not satisfied with the hard disk partitioning 
.
Some areas were very small, and I couldn't distribute them correctly.
As I am a bit of a neat freak 
.
So I decided to do a new installation. Now everything is the way I want it and runs perfectly.
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