Weird letters error

[BardiaDalir]

Hello I was wondering if theres someone that could tell me how to fix this probem I got... When I log-in, after a while, my screen stucks and few seconds later appears this error:



When I click on "Accept" ("Aceptar") I get this second error right after:



Then client keeps running but this error appears every few minutes and problem is that after appearing a few times I get DC or just my client crushes.

Please I beg for some help here! Thank you.