Problems with the Tenchu series

[Kage-maru]

Hi everybody
Here is my Laptop spec

OP: Windows 7 Ultimate 64bit
CPU: core i3 M330 2.13Ghz x 4Cpus
Memory: 4G
Display: NVDIA Geforce 310M 1990Mb

I'm using PPSSPP 0.91, and have no problem with other games but the Tenchu series (PSP).

For more details:

- Tenchu 3 Portable and Tenchu Kurenai: the emu can play it, but when you enter the loading screen in middle of any stage, the loading keep going on forever. Here is a sample video :



- Tenchu 4 and Tenchu 4 plus: no problem as well, but when you aim the shuriken to an unaware enemy, the screen turns black and black forever.
The same thing happen to the stealth kill, when I approach an unaware enemy, the screen turning, but it returns normal after the kill. When throwing a shuriken, the screen keep blacking forever. Here is the video





- Tenchu Shinobi Taizen: the emu crash and can not play.

I would like to ask that, is there a way to fix these?

Thank you for reading.