K8076 and PIC18F4550 problem

hi to all

I bought a pic programmer K8076(VM134). when i program a PIC16F877A everything is ok.
but when i program a PIC18F4550 then programming process abaut 25%(1000H) and then stops witout any warning.
i use PicPro2009 v3.0.0.5.
is there sombady who can help me?

thx