[PSP- Emu] JPCSP

download (homepage):

http://www.jpcsp.org/index.php?p=Downloads

you also need Java runtime to run the emulator, download it from this link:

http://www.java.com/en/download/manual.jsp

Java runtime is for Windows, Linux and Solaris,choose one of them depends on ur systems,
Besides, u should download the offline installation pack instead of online installation to save the time^^