Help with psp emulators

[SiFi]

I've downloaded NES and SNES emulators for my psp, and copied all the files to the respective folders, but when I try to open either of them up it says the data is corrupted. Can anyone help?

 

[Luigifreak]

Yeah. Buy the real games and systems.

 

[ShyGuy27]

But then they wouldn't work on the PSP.