This is one of the most trusted Windows 7 activators available. It works by injecting a SLIC (Software Licensing Description Table) into your system before Windows boots, tricking the operating system into believing it is running on an OEM-licensed computer.
Since support for Windows 7 has ended as per Microsoft Support , using an activated (but not secure) system leaves you vulnerable to new malware threats. Safe and Proper Alternatives to Activate Windows 7 chew7 v11 build 0684 windows 7 activate