The most recent version of Windows Genuine Advantage (WGA) software was met with a lot of complaints. The worst one by far was how WGA claimed that a copy of Windows was pirated when it wasn't (especially among corporate owners). There were also several instances when a simple hardware change (such as a WiFi card or a video card) made WGA demand a re-activation of Windows. Microsoft has listened to the consumer, and in response to these recent complaints, is morphing WGA to better fit the consumer. Instead of registering a copy of Windows as either Genuine or non-Genuine, it will now register it as Genuine, non-Genuine, or "unsure". There are no details of the functionality of an "unsure" copy of Windows. WGA is also much more relaxed when it comes to a recent hardware change. You can download the latest version of WGA here.