Instead of running the small "web" setup file, you should download the entire ADK toolkit on a computer with a stable internet connection and then transfer it to your target machine. Run the ADK setup file ( adksetup.exe ).
: Attempting to install an x86 (32-bit) component on a system that requires a different configuration can sometimes trigger "missing file" errors if the installer pathing is not properly defined for the environment. Spiceworks Community Recommended Troubleshooting Steps Disable Security Software
: Try adding your user account to the local Backup Operators group.