Windows 10: Removed a wrong registry key. How do I get it back?

  1.    12 Oct 2015 #1

    Removed a wrong registry key. How do I get it back?

    Hi, I'm still new to this forum. This is the first time I post. I have been reading stuff from here for a while. If I post at a wrong place, please let me know.

    Yesterday I was trying to fix an issue with network adapter on my Win10 PC. I followed a guide I found on the net suggesting that I should try to remove "LowerFilter" key from which can be found under

    However, I believe that I accidentally deleted LowerFilter from a wrong place, under

    Is there anyway I can retrieve or recreate this? Anyone know the value of this LowerFilter?

    Thank you in advance.
      My ComputerSystem Spec

  2.    12 Oct 2015 #2

    You could probably try using System Restore. Hopefully your system has a restore point dated before this happened.
      My ComputerSystem Spec

  3.    12 Oct 2015 #3

    Each of those class values corresponds to a piece of hardware. By removing the LowerFilters or UpperFilters key, it may just stop that particular device working and you would likely need to at least reboot the computer or at most reinstall the software that corresponds to that piece of hardware to restore these keys. Next time back up the registry before altering it.
      My ComputerSystem Spec

  4. Ztruker's Avatar
    Posts : 6,389
    Windows 10 Pro X64 17134.191
       12 Oct 2015 #4

    System Restore is disabled by default in Windows 10, at least on every Windows 10 system I've setup so far, which is 20 or so.

    To enable it,

    Right click on This PC and select Properties.
    Click Advanced system settings at left.
    Click the System protection tab.
    Select the boot drive then click the Configure button.
    Select Turn on system protection and click OK.
    Click Create to make your first restore point.
    Others should be created weekly or as needed.

    Won't help with your current problem if it's disabled but can help with future problems.
      My ComputersSystem Spec

  5. Ztruker's Avatar
    Posts : 6,389
    Windows 10 Pro X64 17134.191
       12 Oct 2015 #5

    I just looked at mine and this is what it's set to:


    Click image for larger version. 

Name:	LowFilt.jpg 
Views:	10 
Size:	23.3 KB 
ID:	42499
      My ComputersSystem Spec

  6. topgundcp's Avatar
    Posts : 2,438
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       12 Oct 2015 #6

    Windows normally keep a backup copy of the registry under:

    So if you boot up from the recovery disk and look at the date of these files. If it's earlier than when you deleted the entry then just copy them back to:C:\Windows\System32\config

    NOTE: Y
    ou need to turn on: Show hidden files/folders options to be able to see these folders.
      My ComputerSystem Spec

  7.    14 Oct 2015 #7

    Just curious....Aren't the upper and lower filters usually referring to CD/DVD drives? Why would you mess with them for a network adapter issue?
      My ComputerSystem Spec


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