The exact workings of CW.exe can vary, but generally, these types of activators use scripts or patches to bypass the Windows activation process. They might:
Windows 7, like other Windows operating systems, requires activation to ensure it's genuine and to access all features. Activation verifies that your copy of Windows has been legitimately purchased and isn't being used on more devices than the license allows. However, for various reasons, some users might seek alternative methods to activate Windows 7, especially if they can't access the internet or prefer not to purchase a license.
Before considering the use of CW.exe or similar tools: