Hello cerio,
Your English is good enough it seems. I have questions about your power supply and the load you have hooked up to your PIC. Is there a posibility you are drawing too much current on an output or on your power supply? I see you have disabled BODREN. Your MCLRE pin, Is tied to +, yes ? Through what ohm value resistor? I would add a .01 uf capacitor to the power pins directly at the PIC and perhaps, a large capacitor of say 50uf as a transient buffer too.
HTH
JS
EDIT: one last thought, if you are having this problem on a breadboard, IT may be the problem.