Windows 8 and 8.1 Forums


What is C:\Users\MSSQL$ADK ? Is it legitimate?

  1. #1


    Posts : 4
    Windows 8.1

    What is C:\Users\MSSQL$ADK ? Is it legitimate?


    Hi, All!

    I was trying to clean up my laptop prior to upgrading to Windows 10, when I noticed something odd with my C:\Users directory. Nobody else uses this laptop. It's an HP Pavilion with Windows 8.1.

    Under C:\Users, I have my normal user directories: one Administrator user, one standard user, one Public, one Default and one Guest. But I also have an additional directory for a user name I've never seen before: "MSSQL$ADK". It has all the normal subdirectories, such as AppData and Documents. Date directory was created is 05/22/2016. Date last modified is today.

    If I look at my User Accounts in Control Panel, I only have my normal Administrator, standard and Guest accounts; MSSQL$ADK isn't there.

    Has anyone seen MSSQL$ADK before and know what it is? Is it an innocuous directory installed by one of my legitimate programs, or should I be posting in a malware forum?

    Thank you for your help.

      My System SpecsSystem Spec

  2. #2


    Austin TX metro area
    Posts : 638
    Windows 7 Pro 64bit [MS blue-disk set]
      My System SpecsSystem Spec

  3. #3


    Posts : 4
    Windows 8.1

    than you, but Google results not relevant


    Thank you for googling MSSQL$ADK. I did the same, and got the same results; but none of them tells you that MSSQL will install something that looks like a user directory; and none of them makes reference to the term "MSSQL$ADK". So Google found no relevant results. And that is why I posted my question in this forum.

    Has anyone seen this issue before?
      My System SpecsSystem Spec

  4. #4


    Austin TX metro area
    Posts : 638
    Windows 7 Pro 64bit [MS blue-disk set]


    Leah, I forgot to earlier indicate that I was and still am as puzzled as you are! I'll be watching this thread and learning alongside with you.
      My System SpecsSystem Spec

  5. #5


    Newport, South Wales, UK
    Posts : 573
    Windows 10 Pro x64 x2 Windows 10 Enterprise x64, Ubuntu


    It is not unknown for application suites to run their services under a specific user, to control running whilst not using system user accounts, and this will cause the creation of the entry you see in the users area.

    I would assume that you have at some time installed either MS SQL or something that utilises this to handle data management If you are no longer using this then it should be harmless to remove the user from the system, but as this is a Microsoft related system account it is probably best to just ignore it
      My System SpecsSystem Spec

  6. #6


    Posts : 4
    Windows 8.1


    Thank you, Barman58. That is very helpful.

    I have used MSSQL in the past, but not in the past year. I've done some data recovery recently, and tried out several types of recovery software. Now that you've explained that some applications run services under a specific user, I will look into whether any of the software I tested runs under MSSQL.
      My System SpecsSystem Spec

What is C:\Users\MSSQL$ADK ? Is it legitimate?
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