I want to get my OS back

Greetings!

Well I used the OS recovery tool of Dell but it says that "No OS images found for the tag. Though images exist for the product".

So why is that all Dell laptops have OS of Windows in them right?

SO guys help me I purchased this laptop Inspirion 5567 so its really expensive and I even payed extra for getting windows.   so if I don't get original OS I am really sad...

And I even talked with Microsoft they said that    "Please be advised that Though Microsoft is the one who produces the key itself; the moment Keys are being tagged under a particular manufacturer, the OEM restricts its possession and Microsoft loses its rights on that Key which is why no tools and steps can allow as to get the Product Key. It's the manufacturer's responsibility to have the list or copy of your Windows key as they are the ones who are installing it on a specific device. Please inform them that Microsoft already assisted you with retrieving your Windows key and since it's pre-installed on your device, they do have the capability to override or get the copy of your Windows in order for you to activate Windows. Please ask them to provide the copy of your key. We do not have the capability to produce product keys. Also, Windows is pre-installed on your device, meaning the manufacturer is the only one who has the capability to retrieve it or to override the key for you."