12 East 34th Street, 5rd fl. New York

OEM activation for Windows 7

OEM activation for Windows 7

I have recently re-install Windows 7 on my Lenovo laptop using a Dell DVD installation and found that Windows OS prompt ‘This copy of Windows is not genuine.’ I was not able to use the CD key from Lenovo laptop as it prompt that the key is incorrect since I use a Dell disc for installation.

In windows Vista, 7, server 2008, 2008r2, and server 2012 OEM activation is accomplished by the combination of 3 elements.

  1. The bios of the system must contain what is called a “SLIC” string, all systems made by a major OEM such as Dell, HP will include this. Home built systems will not (unless you modify the bios yourself)
  2. A certificate file that matches up against the “SLIC” string that is stored in the BIOS. These certificate files are unique to each OEM so Dell has their own, HP has their own, etc. and are not interchangeable.
  3. A Windows product key that tells the system to use OEM activation instead of the traditional Microsoft activation process. These keys are not specific to a particular OEM and are interchangeable.

If all 3 are present the system is instantly activated, does not communicate with MS to determine if activation is valid or to activate against a MS server. The activation is already trusted.

When you rebuild a PC, component 1 is still present but #2 and #3 are missing.

Attached in the SLIC.zip file you will find the certificate files used by Major OEM’s such as Dell, HP, Lenovo, as well as product keys that can be used for Windows 7 Professional, and Ultimate. You can download the SLIC file from here. In my case I use a Dell SLIC file since I use a Dell DVD disc for installation. I will also need a Dell CD key.

Follow the below steps to activate Windows.

  • Open an elevated command prompt, extract the Dell certificate to C:\temp
  • The certificate is called Dell-Dell-2.0.xrm-ms
  • Issue the command slmgr –ilc c:\temp\dell-dell-2.0.xrm-ms
  • Then issue the command slmgr –ipk 32KD2-K9CTF-M3DJT-XXXXX-XXXXX (For windows 7 Pro)
  • Wait about 5 seconds and if you look that system is now genuine and activated.