Note: Make sure to write these codes down, or 'copy and paste' them into a TXT file and 'Save' them to your portable storage device before continuing. You will need to bring these codes with you, to complete the next step. Make sure to bring your portable storage device with you when you visit an external location with Internet access, in order to 'activate' your game. Again, make sure this Internet 'source computer' will allow you to copy data to the personal storage device before you continue. STEP TWO: On an external computer with Internet access, you now need to generate an 'Unlock Code'. You may even want to try to generate an 'Unlock Code' on a different PC in the same location first, as personal firewall settings can be different from PC to PC. To generate your 'Unlock Code' for GTA IV PC, enter your Product Code (serial number) and Unlock Request Code (that you brought with you) in the fields provided below.