Because Chew-WGA modifies the core activation client, it can cause conflicts with future Windows Updates . If a future update attempts to replace a file modified by the activator, it can result in a broken system or a "black screen" failure.
Using unauthorized software to circumvent licensing is a violation of Microsoft's terms of service and is considered software piracy. Legitimate Ways to Activate Windows 7
Primarily used for Windows 7 systems where traditional product keys are lost or unavailable. Risks of Using "cw.exe"