Create a bootable Windows 7 DVD for OEM PCs not supplied with installation disk

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Create iso from OEM installed Windows 7It is a known problem that, most of the PCs: either laptop or desktop those came with factory preinstalled OEM version of Microsoft Windows 7 , does not provide the setup disk. In case the installation gets corrupted, where practically there is no way other than to freshly install Windows 7 finds no solution. The unsatisfied customers curse Microsoft Windows 7 more than the system builder! The logic is simple, an average consumer thinks that it is the Microsoft Windows which has created the problem.

Anyway, I am providing you the only and first method of creating your own OEM bootable copy of Windows 7. Fun is that, I have changed the method from my initial approach so that, hackers, crackers cant not misuse it. This method can create a bootable Windows 7 DVD or pendrive for that particular machine (be it desktop or laptop) only.

I have checked it with three laptops, One from Sony, second one is from Compaq/HP and third from Lenovo. I had to do it thrice for the Lenovo laptop to create it properly: it seemed to me, there is some difference between Lenovo and all other OEM builders: otherwise it must work in all cases. Please follow each and every step.

It is advisable to create one bootable disk if you do not have one or somehow lost it before your system gets corrupted.

There is no valid point for retail copy users to use this method. You can download the trial version from Microsoft technet or MSDN and use your Genuine key to activate your copy.

Softwares and information you will need to proceed for this process:

1. Microsoft Windows 7 retail DVD or untouched ISO of any version (As I said before, you can signup to technet and download the trial. Please do not use pirated copy or so called cracked copy: It is illegal, dangerous as it may contain malwares) or simply can borrow a copy (only the retail installation DVD) from your friend.

2. Ultra ISO

3. OEM CERT for your PC’s Model (Microsoft signed OEM certificate for corresponding OEM-made computer with BIOS that supports SLA 2.0 and build with SLIC ACPI table from Dell, HP, Lenovo, Asus, Acer, Sony or other manufacturers.).

4. OEM Key for the brand and version you have installed.

Step 1

Backup your system.

Step 2

If you are using retail installation DVD; then you have to create ISO from it. In case you are using downloaded one, it is already an ISO. Open it with Ultra ISO.

In UltraISO  search resources the this file [ ei.cfg ] .Extract it and modify this to change the ID to the version you have installed or bought or installed  (for example: Windows 7 Starter, Windows 7 Home Premium, Windows 7 Ultimate etc). You will need the OEM key for the desired version. Now, modify the channel from Retail to OEM. Save and add it to your iso image.

Step 3

Create an OEM folder on resources of your ISO image:

$OEM%  >  $$/SYSTEM32  >  OEM  > [Your OEM-CERT Here]

Save the ISO image again.

Step 4

Burn the modified ISO to DVD.

Step 5

When you will format/install Windows 7, it will ask for the OEM key. Just enter it. Windows will check these in background (you can not see them)


Obviously it will pass.

Step 5 : Activation

Activate either over the internet or phone.

Download Genuine Advantage Validation tool and run it to test.


Note: Please do not try to be over smart. You can not activate Ultimate version if you have purchased say Home Premium. We have wrote the tutorial in the way, you can not do it.



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  1. John says

    Fantastic writing!

    My laptop had nothing to format it and it can not even boot into Windows…I used your method, searched Google for the data you mentioned and created in my friends desktop!

    I have been a fan of you!

  2. stupid woman says

    so it’s something I need to download and not something I need to extract from my computer?

    it’s a Samsung – don’t know what it is I’m looking for..

  3. says

    Thanks Shilpa for answering.

    It sounds bad if I call you as “stupid Women” ! Anyway; as Shilpa said rightly; there is is no other way for the general users. For bulk purchase (like developers), the Cert is issued by Microsoft.

    Distributing Cert is borderline-illegal (according to Microsoft).

    Contact Samsung for the bootable DVD after paying or Purchase a Retail Windows 7 DVD.

    Also consider using Linux (which is fully free).

    You can see this post :

  4. stupid woman says

    Thanks for your speedy answers – but I don’t really want to give samsung any more money – I just want to install windows the way I want to install it!! It seems unfair that I should have to purchase another copy of windows when I have one here purchased with my laptop… and linux would be great if it worked with itunes and a few other programs… So is there nothing I can do?

  5. says

    You are Welcome.

    No sane person will be happy to pay twice. There is no way other than paying (in legal way). Moreover, if you upgrade components like the hard disk; the OEM license gets invalid. For retail version this restriction is not present.

    You can use any Windows program in Linux using Wine emulator. Elive has a bundled emulator to run Windows applications. There are many Linux distributions like Debian, Ubuntu, Open Suse, the link I gave of Elive : all are free.
    Ubuntu has a bigger community, so its better for beginners. Debian is rock solid (Elive is based on Debian). Open Suse is great too. You can use different environments with Linux like KDE Plasma :

  6. Arif says

    Hello Dr,

    I have a small problem with my Dell Inspiron Laptop. It comes with a preinstalled Win 7 (64bit). It comes with a lot more of the junk softwares in it. I have created a recovery CD (the one you would use to format the entire hard disk and reinstall to factory setup).

    However I am unhappy with this as the OS preformats the hard disk to 30 GB of C drive and another 12 GB as backup. Also, it installs all the unwanted software which came with the factory setup. I would like to know if there is any way I can create a light version for my original OS. This should not contain unwanted softwares, should be able to boot from a DVD and must not create backup partition on my hard disk.

    Any suggestions, comments will be much appreciated.

  7. says

    Hello Arif. Welcome to TheCustomizeWindows :)

    Those junk softwares are (better known as “crapwares”) are part of the OEM version. For those crapwares probably the OEM version costs less (the software companies pay a part) with more RAM and higher spec.
    You can De-crapify using some third party softwares, but you will not able to kick out all the craps : they are somehow “integrated” in to the OS.

    Legally, we can not do anything with these : neither create a lighter version out of it nor can change the backup option : the installation DVD is compiled in that way.
    When buying a OEM pre-installed laptop, actually users are unknowingly accepting their terms and conditions of usage.

    So your options are:

    1. Decrapify (Google it) using some third party software / Windows uninstaller (if allows) and live with it.
    2. Buy a retail version to get the full control.
    3. Install Free Linux (as said ago).

  8. Deepak says

    I have a question. I have windows 7 which came preinstalled with my acer laptop. I have dual booted it with Ubuntu+Windows. Ubuntu is my primary OS, and I dont want to loose my genuine windows copy, but the problem is window is not releasing enough hard disk after shrinking and around 200GB is with windows which I dont use. Is it possible with this method to create bootable copy of windows and use that in vmware as a virtual OS, so that whenever occasionaly I need, I will have my windows too.

  9. says

    Hello Deepak,

    Case 1 : Using a bootable copy of your existing Windows 7 in vmware as a virtual OS is not possible as per Microsoft’s Licensing policy – in this case, I am not going to technical part whether creating a bootable copy is possible or not. In other words you have to buy a separate Retail version of Windows 7 for using it on virtual machine. If you have 2 VMs then actually 2 licenses are required.

    Case 2 : Pre-installed versions usually ‘customized’ the version of OS. You can try to separate it using Disk Management, with our retail versions its quite obviously easy, I am not sure about OEM.

    If you have a bootable OEM from Acer, you can try to wipe out and install Ubuntu as sole OS with two partitions first, leave the disk partition you want for Windows as FAT32. Then install Win 7. Windows bootloader will vanish Ubuntu’s boot loader, you can easily create the way of dual boot using EasyBCD from Win 7 (link of EasyBCD is here –

  10. Windows Anytime Upgrade says

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  11. Joe says

    I have a friend’s laptop, HP DV4 Win 7 Pro 64bit. HDD Crashed, installed 500gb HDD in place of 320gb. Ordered Factory restore DVDs, will not run on the system. Tech says I MUST have the 320gb replacement drive from HP to do the Factory restore. Is there a way around this? I used Acronis to change the size of the new drive, still will not run. Thank you

  12. Abdelrahman Hossam says

    Hey what’s the difference between this method and for example the “Back up and Restore”, “Create a system image”, or “Create a system repair disk” in Control Panel.


  13. Matisek says

    In my case if I have lenovo my [Your OEM-CERT Here] is lenovo.oemcert.100036.xrm-ms which is located in C:\Windows\System32\OEM or the right one is that generated by SLIC ? Which is named just LENOVO_V2.1_Cert.xrm-ms
    Which one lable is correct one, because both has the same size 2,66 kb.
    Also I would like to ask if “ID” is 27GBM-Y4Q….. generated by SLIC found in ProductId.txt right one or I have to just simply write down “Windows 7 Home Premium” in file [ ei.cfg ]

    thanks for answering

  14. says

    Basically this method is a kind of violating their usage policy (circumventing measures), so unfortunately we can not help much for this particular article.

  15. says

    Backup – usually manually copying the files and folders to CD, DVD, another hard disk, pen drive, cloud backup services, pen drive etc. All files like images are readable on any computer (Mac, Ubuntu / Linux, Windows, Web etc..).

    Back up and Restore : Usually uses a proprietary format and within few click the backups are exactly populated. Individual files might not be readable.

    Create a system image : Take a snapshot of all files and folders. Time Machine is the prototype of such in Mac.

    Create a system repair disk : Bootup disk usually for OEM Windows who unlike retails has no proper disk to boot with DOS.

  16. Stefan Leigh-Lancaster says

    I’m not sure if there’s any way you can help me. I don’t know how to follow these instructions. I have Roxio Easy Media Creator 10 LJ and UltraISO. I don’t about this OEM, OEM CERT and some of the other bits.

  17. Bastien says


    Great post ! I hpoe it will save my life.

    I m going to do what you wrote but I don’t understand which is the name and the emplacement of the OEM directory I have to create in the ISO file, the one where you place the OEM cert file.

    You wrote the path with some $$ and /, so i don’t understand.

    Do I have to create at the root of the ISO an OEM folder, which contains a System32 folder, which contains an OEM folder, which contains the cert file ?

    Thanks a lot for your answer ! :)
    Cheers !

  18. says

    Hello Bastien,

    I hope so! Thanks for the kind words.
    $ stands for the drive. As the drive letters will vary (it can be E: for me, F: for you Z: for another person), so those odd notations are used ! Yes, you found that System32 folder, that is the $$/SYSTEM32 thing !

    Sorry for the belated reply. Let me know what happens the next.

    - Abhishek

  19. Bastien says

    Thanks a lot for your quick reply :)

    Finally, I found the easiest solution :

    It takes one minute and it was better for me because I already have installed Win 7 on my new SSD. It works like a charm.

    But thank you to propose another solution. I called microsoft and HP support and they had nothing to do with my problem.

    Thanks for your work

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