I was emailed about this problem and the AutoCAD user found that the last solution helped in his case. If you have this problem take a look at the links below.
Register Today (Product Activation Wizard) displays only two radio buttons
When you started the product and chose the Register and Activate option, the Product Activation wizard displayed only two radio buttons that did not have any associated text descriptions. Also, there were no Next or Cancel buttons that would allow you to proceed with the activation or cancel it.