see this video to learn how to ownload the PSPWXP (Windows Vista portal) file onto your PSP.

steps:

1. Settings / System Settings / Enable Flash Player & Enable WMA Playback
2. Internet Browser / Tools / Delete Cookies & Cache
3. Internet Browser / Tools / Homepage Settings / Apply homepage as: file:/pspwxp/index.htm
4. On your computer, enter URL: http://www.savefile.com/files/391290
5. On bottom, click DOWNLOAD.
6. When download is completed, open zipped file once, then extract the first file you see (PSPWXP file that is not zipped). Remember: DO NOT PLACE THE ZIPPED FILE ONTO YOUR PSP FILE, IT MUST BE EXTRACTED!
7. After extracted, drag folder to desktop.
8. Connect PSP to computer.
9. Drag the extracted file from desktop onto the PSP folder after opening the Removable Disk ONCE! (The main section where you see MP ROOT…etc)