Open the (search for regedit in the Start menu).
The original game has a "64MB memory bug" that causes crashes on modern systems. Look for the "Porsche Unleashed Essentials" "IPL Patch" online to fix graphics and performance issues. No-CD Fix: Need For Speed- Porsche Unleashed PC Serial Key
If you are looking for a serial key for Need for Speed: Porsche Unleashed Open the (search for regedit in the Start menu)