Oh, God, I did it!!! You have no idea how happy I am!!
Few minutes ago I was going to whine that nothing's changed, I was trying to solve the problem for like three or four hours, but the solution was really simple)
In a word in Intel Graphics and Media Control Panel (right click on the desktop) and then in 3D customisation I changed from "balanced" to "quality" and now everything's great!) I'm so stupid)) How couldn't I try this on the very beginning?)
And by the way, Melvoid, I tried to
start with all options down as low as possible then turn them up one at a time after testing to see when the problem returns ( if it goes away at all)
almost after I only started the game and nothing changed at all (with the fonts). But thank you for trying to help me!) And though the updation of FAQ didn't help me either, thank you Crashbanito!)
And now Legend of Grimrock is waiting for me!!))