1. Open a command prompt.  If you are not sure how to open a command prompt, click the Windows Start menu, type cmd, and press Enter.



  2.  in the Command Prompt window that opens, type vol c: and press Enter.



  3. In the displayed output, find the 8-digit number listed as the Volume Serial Number for C drive. Make sure that the message is Volume in drive C is OS.


The case of the letters is not important and no dash is included.   In this example, you would enter 12abcd34


Only the C: drive is valid.  Do not check other drives.  If you don't have a C: drive, then don't use a Disk Serial Number for your license. 


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