How do I get DVD for the Windows 7 that should have come with my new laptop please

Question

This is my first message here so please bear with me. I have just bought a new Lenovo Essentials B570 laptop which has come with Windows 7 pre-installed. Previously I used to buy Dell laptops which used to come with OS Re-installation DVDs which check to see if they are being installed on the hardware it was bought for but would allow us to install the OS on a new hard disk if the original one crashed. Now Lenovo seems to be using a very complicated method to allow buyer's to re-install the OS - they are expected to retain the same hard disk - but what happens is the hard disk crashes and one wants to install the OS along with all the drivers? The Dell DVD allows me to do precisely that. Can I create a similar disk to install the OS on a new hard disk as and when I want/need it please? I have created two sets of DVDs using the OKR software - one set using the 'system presently on disk' and another set for 'resetting to factory defaults' - but from what I have read on these forums these OKR disks would not work if I put a completely new hard disk. So at least if I can get hold of the correct version of the Windows DVD - as I have paid for the license I would be very grateful. Thank you.
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Answer 1

yigit wrote:
http://forum.lenovo.com/t5/Lenovo-3000-and-Essential/How-to-create-quot-Factory-Default-Recovery-Dis...
Thanks for the quick reply.
But to me this looks more like a OKR solution and I have already created these Factory Reset discs.
Will these discs work if I have installed a completely new hard disk in the dive? Because that is what I would need to do in the rare event that I have a complete hard disk failure.
What is confusing is the fact that on these forums, I find many messages which indicate that the OKR solution would work only with the original hard disk and it would not work with a completely new hard disk and also that the OKR itself would not be able to change partitions on the hard disk - even when it is the original hard disk. To me this means any disks that are created using the OKR would be useless when the original hard disk has undergone severe change or a completely new hard disk is in its place. Correct me if I am wrong. (In fact I am hoping that I am wrong in that assumption.)
My laptop has a 750GB hard disk and it has Windows 7, 64bit. I actually want to make this into a dual boot machine with KUbuntu. What is stopping me attempting that is the fact that C drive has bigger partition and D drive is a smaller partition (too small in fact - 30GB these days is practically nothing) and I learn that any modifications I do to drive partitions would render the OKR non functional.
I can live without this simplistic one key rescue operation if I have recourse to the Windows 7 DVD and that is why I asked the question.