If some Windows features do not work or Windows does not work, use the System File Checker feature to scan Windows and restore files.
Although the steps below may look complicated at first glance, you simply have to do them one by one, step by step, and we’ll try to get you on the right path.
Running the System File Checker tool (SFC.exe)
Open a command prompt with elevated privileges.
If you are using Windows 10, Windows 8.1 or Windows 8, first run the Deployment Image Servicing and Management (DISM) utility, and then run the System File Checker tool. (In Windows 7 or Windows Vista, go straight to step 3).
Enter the following command and press ENTER: The command operation may take several minutes to complete.
DISM.exe / Online / Cleanup-image / Restorehealth
Important: When you run this command, the DISM utility will use Windows Update to provide the files required to repair the damage. However, if the Windows Update client is already damaged, use the Windows installation that you are running as a repair source or use the Windows parallel installation folder with a network share or removable media, such as a Windows DVD, as the source of the files. To do this, run the following command:
DISM.exe / Online / Cleanup-Image / RestoreHealth / Source: C: \ Repair_Source \ Windows / LimitAccess
Note: instead of the placeholder “C: \ Repair Source \ Windows”, specify the location of the repair source.
At the command prompt, type the following command, and then press Enter:
The sfc / scannow command will scan all protected system files and replace damaged files with a cached copy, which is located in the% WinDir% \ System32 \ dllcache compressed folder.
The% WinDir% placeholder is a Windows system folder. For example, C: \ Windows.
You can download the DLLs on this website : Download fix DLLs