Ff4 complete collection major error

This is really pissing me off.. i have a
psp 1000 with 6.39 pro b7 cfw (i had
to update from 6.20 to even play it)
Im playing ff4 complete collection.
(jap) basically, when i try the data
install option it comes up with an
internal error? wtf? also every now
and then the game will freeze with a
black screen? help?

How did you get the game? through download? ISO or CSO?If yes, you don't have to use the Install Data option since the game already in your memory stick, unless you playing it using UMD.and if you have any plugins installed, disable it, and run the game.