1. Press Win + R on your keyboard.
2. Enter services.msc in the search field and click OK.
3. Find the Base Filtering Engine in the list of services.

4. Make sure that it is running. You should see the status Running in the Status column.
   If this status is not displayed, right-click on the Base Filtering Engine service and select Start from the shortcut menu. 

The Base Filtering Engine service is now running.

When starting Base Filtering Engine, you may get "Error 5" (access denied).

Solution

1. Open the registry editor. For instructions, see this article.
2. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
3. Right-click BFE and select Permissions in the context menu.

4. Click Advanced.

5. Click Add.

6. Click Select a principal.

7. Type Everyone and click OK.

8. Select the Full Control checkbox and click OK.

9. Select the checkbox Replace all child object permission entries with inheritable permission entries from this object and click OK.

10. Click OK.