1)Click on the Start menu and type cmd in the search box. Type CTR+SHIFT+ENTER to tell the command prompt to open with elevated privileges.
2)In the command prompt window, type netsh int tcp set global autotuninglevel=disable and hit Enter
3)After getting the OK returned in the command prompt window, restart to activate the change.
If the change doesn't help, you can always revert by going though the same process, but instead, use the command:
netsh int tcp set global autotuninglevel=normal
Don't forget to reboot!