Thats fine. We'll do step one now.
#1 Download the 'Desperter Cementario Auto Installer' form the link in my sig. Extract the contents to a new folder on your desktop.
#2 Format your memory card on your PSP.
Please remember that Formatting your MS will delete everything on it. Back up anything you don't want to be lost.
#3 Connect your PSP to your PC, and run the Batch(.bat) file in the new folder.
#4 I feel that the on-screen text is easy to follow. I will not explain how to use the installer, unless asked a specific question.
That is step one.
Let me know when you finish
You need winrar to extract the DCV4 Auto installer BTW.