We are investigating this issue in conjunction with our hardware partners, which appears to be related to system firmware. We are working with our partners to determine the root cause and will update the Windows TechNet forum with information and guidance as it becomes available. Best regards, Alex Microsoft Windows Client Team

Like some commenters noted, there is no need to wait until SP1. Windows 7 has been through a very wide Beta, then RC, RTM and finally the GA last October. During this whole process, IT Pros around the world have been able to test the new OS for performance and stability and have found Windows 7 to be great! If you want to follow us on Twitter (@MSSpringboard for IT Pros or @CIOsConnect for... CIOs) we can point you to people's feedbacks on the topic. Alex Microsoft Windows Client Team