Gaming@NINA

I have a 1.50 PSP, and im trying to use UMD Emulator 0.8c to load ISO's. UMD Emulator is installed correctly, but when i place a ISO into the ISO file, and run the program everything works fine until i try and run the ISO, then the program freezes after i select it. Do i have to do anything to the ISO's before i used them ? I have tried a number of ISO's with the same results. I also tried using Fastloader 0.7 and the same thing happened !!
Also i know that i have to put any UMD to load the ISO
It would make me really happy if someone could help me out on this one.

First I'd check a compatibility list (my only suggestion is to look for one at maxconsole.net) and the only other thing I can suggest is making sure you have a UMD in your PSP.