: Since this is not official Microsoft software, there is no guarantee of what the .exe actually does. Most security engines flag these files as "Potentially Unwanted Applications" (PUA) or malicious.
: The most straightforward method is using a valid product key. This key is typically provided when you purchase a copy of Windows 7. You can enter it during the installation process or activate it later through the Control Panel. Download - Activator Windows 7 Cw.exe