When you uninstall Windows 7 Professional from your laptop and then install the 64-bit version on your desktop, you may face issues with re-validating it if you have already activated the license key on your laptop. Windows licensing is typically tied to a specific hardware configuration, and the license key may only be valid for the original device on which it was activated. Here are a few things to consider and potential scenarios you might encounter: 1. OEM vs. Retail License: If the Windows 7 license that you have is an OEM (Original Equipment Manufacturer) license that came pre-installed on a computer, it is usually tied to that specific device and may not be transferred to another system. 2. Product Key: If you have a...