Using such software to activate Windows is a violation of the Microsoft End User License Agreement (EULA) .

became the primary hubs for distributing these tools. As a cloud storage and file-sharing service, 4shared allowed users to upload "activators" that were frequently updated to stay ahead of Microsoft’s security patches. An "updated" version on 4shared usually meant the loader had been tweaked to bypass specific KB (Knowledge Base) updates

— Using a loader violates Microsoft's software license terms. Windows 7 requires a genuine product key for lawful activation.