visit boot sale and buy an old computer that works with XP on it or partition hard drive and install XP in the partition ,also their is a facility that comes on when you go to install allowing you to roll back to XP drivers ,i have used it myself but i cannot remember how to get into it i think the option comes up when you go to install .
Right click on the icon you use to launch the game and go to properties. Click the compatability tab and check the box that says "Run this program in compatability mode for:" and make sure the drop down box in on Windows XP SP3. Click "Apply" and then "Ok". Try running the game again.
You can only LEGALLY get a product key for a commercial software such as that game by purchasing the software, or purchasing the key online through an authorized retailer. You may be able to purchase the game used on Ebay or Craigslist.
Okay. This is a tutorial on how to download psp games on your PSP for free, please access this link to watch the video on youtube: http://www.youtube.com/watch?v=ut_Usydv5E8&feature=related You will need a psp running custom firmware 3.71 m33-3 or higher.
To get custom firmware, please access this link: http://pspslimhacks.com
Remember if the game you want is a bunch of different parts then download the parts and select them all and extract them all to one folder.
And also, remember to always have a umd in the psp, otherwise it will say the game could not be started
