Once you have your legal backup, the file will be in .iso or .cso format. Place this file in a dedicated folder on your hard drive (e.g., C:/PSP Games/).
Even with PPSSPP, you might hit a few snags. Here is how to fix them: Parasite Eve- The 3rd Birthday PC Download
The best and most trusted emulator is PPSSPP. Once you have your legal backup, the file will be in