I have no squre barcktes in keyboard

Answer 1

Then maybe you need a new keyboard.
That's the only way, right?

Answer 2

Changing keyboard is the best way, but if don't want to do that then you can use "On-screen keyboard" of windows. Here is procedure for enabling it.
https://support.microsoft.com/en-in/help/10762/windows-use-on-screen-keyboard

If that's not enough then you can also download Virtual keyboards for your PC. Virtual keyboards are similar to the On-screen keyboard.