Converting a Dell Windows 7 Professional Reinstallation USB to another Edition

Tutorial Video

End of Life Notice

Windows 7 Reaches End of Life in January 2020. Windows 10 is a Free Upgrade to Windows 7.

You can Clean Install using your Windows 7 OEM Key affixed to your systems COA or by generating a genuineticket on your Windows 7 OEM Installation.


Dell currently offer only a Dell Windows 7 Professional Reinstallation ISO for Download. This makes it problematic to install Editions of Windows 7 for example Windows 7 Home Basic, Windows 7 Home Premium and Windows 7 Ultimate.

It is however relatively easy to convert a Dell Windows 7 Professional Reinstallation USB to a Dell Windows 7 Home Premium Reinstallation USB, all we need to do is modify two files. See my guide Downloading a Dell Windows 7 Professional ISO Using the Dell OS Recovery Tool and Making a Bootable USB:

Updating the Other Editions

Note in the Dell Windows 7 Professional Reinstallation ISO all 4 64 Bit Editions (Home Basic, Home Premium, Professional and Ultimate) or 5 32 Bit Editions
(Starter, Home Basic, Home Premium, Professional and Ultimate) are present. The Professional Edition is Updated to have Driver support for up to 6th Generation Intel Hardware while all other Editions are left unmodified from 2010. In order to install Windows 7 with USB 3.0 Ports, NVMe Storage Controllers it is necessary to Update the install.wim which I instruct in doing so in my Slipstream Updates and Dell System Drivers into Dell Windows 7 Professional Skylake Reinstallation USB. Another advantage is it also saves a great deal of time updating. On older hardware however the slipstream may not be necessary as you may have USB 2.0 ports only and older Storage controllers which Windows 7 has inbuilt support for.

Selecting the other Editions in the ISO

Although you can modify the two files in Notepad, I advise installing Notepad++ to modify the two files:

Open up Windows Explorer, look at your Bootable USB. In my case it is Drive D:\

You may have a different drive letter.

The first file needing to be changed is the EI.cfg file it is found in D:\sources

Right click this and Edit it with Notepad++

You are only wanting to change one line, this word professional to the desired edition. What you type should all be lower case with no spacing:

I will demonstrate with Home Premium but you can slide across for the other editions.

Home Basic:
Home Premium:

The second file is the SLP.cmd file found in the D:\sources\$$\$OEM\setup\scripts

Once again right click it and select Edit with Notepad++

This file contains two lines, the first installs the OEM certificate (which is the same for all Editions) and the second installs the Generic OEM SLP key.

We only need to change this generic OEM SLP key to match the generic OEM SLP key of the Edition of Windows 7 we wish to install. Once again I will demonstrate using Home Premium

Home Basic:
Home Premium:

That’s all the Windows 7 Installation Media will now install Windows 7 Home Premium or the Edition you select Opposed to Windows 7 Professional.

You will not be asked what Edition to select during installation and instead be taken straight to the Home Premium License screen:

You will not be asked for a Product Key during installation:

OEM System Locked Preinstallation Activation will occur in the background. You can check your Product Activation by right clicking Computer and selecting Properties:

Your system will be activated if you have an eligible Dell system with a System Licensed Internal Code of 2.1 embedded in it’s Legacy/UEFI BIOS.

If you aren’t using a Dell System or a Dell System without a SLIC of 2.1, Windows will not be activated:

Solid State Drive Upgrade

Before you use it to Clean Install Windows 7, now is an excellent time to consider upgrading your systems slow access Hard Drive to a fast access Solid State Drive. Clean installation directly onto a SSD will substantially speed up your system. See my guide below for more details:


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