you need to create a DWORD at HKLMSystemCurrentControlSetServicesLanmanWorkstationParameters with key DisableLargeMtu and set the value to 0, then reset the computer.
DomStation
Computer World & Legal File Manager
you need to create a DWORD at HKLMSystemCurrentControlSetServicesLanmanWorkstationParameters with key DisableLargeMtu and set the value to 0, then reset the computer.