Regardless of the ubiquity of 64 bit computing, key factors such as hardware and application compatibility remain a issue, especially for legacy systems. You may be transferred to another department to activate the key before it can be used. If you are running a 32 bit version of Windows, whether Windows 8 or Windows 7, you need to consider carefully the steps to migrate from it to 64 bit Windows 8. Follow additional any additional activation instructions provided to you by the agent.Read it back to confirm you have written it down correctly. Write down the product key exactly as it is read to you by the agent.Provide the representative with any requested information, which may include your computer's serial number (if Windows 8 came with your PC), information from Windows 8 DVD (if you have the media), and your credit card details once your request is processed. Tell the representative that you can't access your Windows 8 product key.Follow the phone prompts to reach an agent who handles product key issues.This is a paid Microsoft support line ($40-60 per issue), but you will not be charged for support if you are just calling to purchase a replacement product key. A product key is usually required when uninstalling or reinstalling Windows 7 or Windows 8.1. If you are still having trouble finding your product key, you can purchase a replacement key for $10 from a Microsoft support agent. Locate your product key for Windows 7 or Windows 8.1.
Contact Microsoft to request a new product key.