A: The QC Region ReportBuilder tool requires the Silverlight 4 runtime. Check out the compatability here.
Q: What is Silverlight?
A: Microsoft Silverlight is a powerful tool for creating and delivering rich Internet applications and media experiences on the Web.
Q: How do I install Silverlight 4 on my computer?
A: When you attempt to run the QC Region ReportBuilder tool without Silverlight installed you will be presented with an "install" screen. Follow the directions to complete the install.