Tools like Kj Starter typically operate as "loaders." They do not simply input a stolen product key. Instead, they exploit the way the Windows bootloader works.
By modifying the Master Boot Record, these tools leave the system in a fragile state.
: Most "activators" found online are bundled with malware, trojans, or ransomware [1, 2]. These tools often require you to disable your antivirus, giving malicious software full access to your system.
All are free, legal, and receive security updates.
If you already downloaded and ran “Kj Starter” or similar tools, assume your system is compromised. Take these steps immediately: