Finally i get the solution!

I s a litle biot xtreme but the expression ALT + 255 works correctly.

i change the operative system. i had windows 10 but now i have windows 7.

i have I7 processor with windows 7... the installation was difficult because the operative system doesnt support the new hardware. when i install it, it doesnt recognize the grapich tarjet, usb ports, the keyboard etc. So i must download drivers in another PC and then try to install...

Thanks for all!!!

greetings for your friend and neighbour,