Try using "Game Copier" to make your isos. It's a free 15 day trial (enough toime to convert any PS! collection) and it works perfectly with little to no reconfiguiring for PSP1 CDs.
I use popstation.exe (not gui). Try following my guide here. Lemme know how it goes...
http://www.pspmod.com/forums/emulati...x-problem.html (Psx Problem!!!)