you were right. it had to do with the OS. for some reason the register of the Arial font has disappeared, but I just solved it!
I had to import it back to my register and now it is back to normal Arial.
thanks a lot
One day, the font of the game (all the fm's stores' names and chatting fonts) has changed only on my screen. (I downloaded the game to another laptop and the font there is the original one).
I tried to re-download the game, but that hasn't helped.
anyone knows how I can change it to the original one?