The Installation and Error Troubleshooting section is designed to guide users through the process of resolving all technical issues and error codes encountered during Windows license activation and setup. From complex activation errors (like 0xC004C003) to missing file warnings, these guides provide step-by-step solutions. The crucial first step toward a seamless installation and permanent activation is always starting with a legal key. Eliminate all risks by securing your Windows 11 Professional Legal License Key from a trusted source.