I have a Ati-means-I HAVE A PROBLEM!!!

[Mamuteo]

Well..... I have little but bigger problem i have the Jpcsp (the last release) and i have configurated for play the KH Birth by Sleep and i almost can play normal when vist a new world in the map world or when i fight with tree boss in the world of te dwarfs o lo que sea the "the screen goes fuzzy i mean is ruled as interference " And i cannor play aswell. weel thos my problem a i really dont know how to fix this because I CAN PLAY!!!!
I have a ATI X1330/X1550 1gb ram (say in the description but really its 258mb) Intel Core 2 duo 2.1ghz 2gb ram The game runs to 10-15fps
P,s:Sorry for mi english is not mi favorite language i speak in spanish XD!!