What are the $NtUninstallKBxxxxxxx$ folders in Windows?

Updated: 11/13/2018 by Computer Hope
Microsoft Windows

Folders such as $NtUninstallKB42773$, $NtUninstallKB873339$, $NtUninstallQ329048$, contain the files necessary to uninstall a Microsoft Windows updates that has been installed on your computer. These folders are hidden in the "Windows" or "Winnt" folder depending on your version of Windows and are shown if you are displaying hidden files on your computer.

If you're running out of disk space on your computer these folders are safe to delete. However, for safety precautions we suggestion only deleting the folders that are at least a few months or few years old. In some rare situations, it may be necessary to uninstall more recent patches.

To locate and delete these files, follow the steps below.

  1. Open My Computer.
  2. In My Computer, open the C: drive.
  3. Open the Windows folder.
  4. In this folder, the first folders listed should be $NTUninstall folders. If you want to delete these files and folders, select all folders that begin with $NTUninstall and are older than a month, then press the Delete key on the keyboard.

These folders are hidden by default. If you can't see them, configure Windows File Explorer to display hidden files.

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