recover old

Hi, I have this old Toshiba Satellite C50-B-14D that my family used years ago. Actual specs: Intel(R) Celeron(R) CPU N2830 2.16GHz 4 GB RAM 500 GB HHD (basic HHD of Thosiba) Windows 10 Currently the computer runs very slow (to open the file manager takes almost a minute), it is practically...