The SimCity Beta is here! However, when signing up you may notice a couple of errors when trying to sign up for the Beta and uploading the dxdiag file. Nowhere do they explain what a dxdiag file is and how to obtain it on the site. Furthermore, even if you do everything right, you will still get an error if you do not change the name of the dxdiag file that you obtained. Here's a quick tutorial to help.