Hello there,
The problem is when you delete the Linux partition the grub is removed and you need to rebuild the Windows boot files. You will need to create a bootable USB with the Windows installation and run these commands to repair the boot files.
The below thread discusses the same issue and you can try out some troubleshooting steps from this and see if that helps you to sort the Issue.
Hope this resolves your Query !!
--If the reply is helpful, please Upvote and Accept it as an answer--