Unfortunately there's not enough information. What platform are you on (Windows, Mac, Linux)? What version of TurboActivate is the user using? Is she using your product in the "cloud" (e.g. Amazon E2)? If so, she needs to be aware that everytime the VM boots it boots to different underlying hardware (that's how Amazon is designed).
Email me her product key so I can dig into this further (email it to support@wyday.com).