Murcealogoman

Ok, here is my problem. When i try to start a game(PSX), it says, Exactly(this game cannot be started. The data is corrupted.) I know it is not the keys.bin file, because i just added that to the nonworking games and it helped nothing . I have a few games working, but 9 out of 12 are not.(saying above error^^). I am a rookie to psp hacking, but i am no moron.
Here are a few facts:
~I am running on FW 3.40 OE (CW)
~I use Popstation GUI 3.00 by Zinga
~I have RE2 and V8 2nd offence and RE survivor working.
~I can't get Test Drive 4, Need for Speed III - Hot Pursuit, Driver, Gran Turismo 2 Simulation disc, or 007 + more to work(can't) Shows error.
~The icons and backgrounds show up fine, but when i click on them it shows error.

Huge thanks in advance!!
PLEASE Help!!