Hi, Thanks for posting in Microsoft TechNet Forum. After checking this issue, I would like to confirm which application you are currently using. Did you receive any error message when you failed to register? Due to it is different between 32-bit and 64-bit versions of Windows, so an application designed for 32-bit versions of Windows may not work properly on computers running 64-bit versions of Windows. Regarding the certificate in Windows 7, you could refer to the following articles: What's New in Certificates in Windows 7 Certificates Hope it helps. Alex Zhao TechNet Subscriber Support in forum. If you have any feedback on our support, please contact tngfb@microsoft.comPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.