Article: Connect your PSP to your computer using the USB cable, or connect your Memory Stick Duo to your computer using a card reader drive, or using a USB adapter. This is the folder you will copy your PSP games to. on your computer.  When you download PSP games, they are usually downloaded in RAR format.  The RAR file contains the ISO files for your games.  You need a program such as WinZip or WinRAR to extract RAR files. You can extract RAR files for free using 7-zip. When you have finished extracting the ISO files, copy the files to the ISO folder on your PSP or Memory Stick Duo.  If the game has many ISO files, you will need to copy all of them to the ISO folder. If you are downloading PS1 games, you will need to copy those files to the "PSP" folder on your PSP or Memory Stick Duo.  Not the ISO folder. After you have finished copy the ISO files to the ISO folder, disconnect your PSP from your computer, or eject your Memory Stick Duo and reinsert it into your PSP. Use the XMB to select the "Game" menu. This folder contains all the games you have installed on your Memory Stick. If the game installed correctly, it should appear in your list of games.  You can open it the same as you would for any game on your PSP.
What is a summary of what this article is about?
Connect your PSP or Memory Stick Duo to your computer. Create a new folder called "ISO" on the Memory Stick or PSP. Extract the PSP rar files Copy the ISO files to the "ISO" folder on your PSP or Memory Stick Duo. Disconnect your PSP or reinsert your Memory Stick Duo. Select the "Game" menu on your PSP. Select the Memory Stick option. Select the game you downloaded to open it.