Here is a tutorial on how to put windows XP on your playstation portable,
First of you will need to download windows XP here is the download link:
Download here (PSPWXP.zip)
1. Download from the link
2. Unzip the files
3. Connect your psp to your computer
4. Put the pspwvista in the root menu
5. Unplug your psp
6. Go to your psp internet browser
7. Type in file:/PSPWXP/index.htm
8. Bookmark it
9. Your done
10.Enjoy!!!