I can't deal with a specific problem. I bought a laptop and it was partitioned in a bad way. Now there was a pre-created partition D:. I deleted this partition and wanted to create a new partition D: with all the unallocated space. However, whenever I try to create the partition, I get the error message you can see in the attached picture. I read about this and I know about partition limitations. But as far as I understand, I have only one primary partition, which is C:. Even more, there used to exist a pre-installed partition D, it was only after I deleted it that I can't recreate one.
So I guess my question is: What's wrong, why can't I create the partition and what can I do to create it? I know there are some programs I could use, but I would want to stay away from those if there is an easy way to deal with the problem through windows. Also I read something about changing the unallocated space into dynamic space by right-clicking it and selecting the corresponding option, but when I right-click the unallocated space, there is no possibility for that.
Another questions I had is what those two partitions without a letter are and whether it is safe to delete them.
I thank you all for your answers in advance.