It prevents Windows from checking whether the copy is genuine

If your copy of Windows 7 Ultimate is not validating, try these safer, official methods: Use a Valid Product Key

If your machine originally shipped with Windows 7, a physical Certificate of Authenticity (COA) sticker is typically attached to the computer chassis (or inside the battery compartment on older laptops). You can input this original key directly into the Control Panel's system settings to trigger an authentic license validation. 2. Upgrading to a Supported, Modern OS

Modifying core system files and the Windows boot sector can easily lead to critical errors. Users frequently report encountering the "Blue Screen of Death" (BSOD), boot loops, or corrupted system registries after deploying activation cracks on 64-bit architectures. 4. Zero Protection Against Modern Vulnerabilities

According to documentation from multiple sources, Chew-WGA can activate:

. It is primarily used to activate unlicensed or "non-genuine" copies of the operating system by modifying system protection files. How to Use Chew-WGA v0.9

Microsoft sells "Windows 7 Embedded Industry Pro" to enterprises. These licenses are still legally available through some resellers for industrial computers. They are 64-bit and fully supported via paid Extended Security Updates (ESU).