I do not have new equipment and this is happening now to one of my two laptops, not both. I'm reporting this from one Win7 device while the other Win7 is redirected to the activation page. My equipment has been activated for 8 months. And it just started an hour ago or so.
As stated in that other person's thread, try calling 1-800-comcast and ask a rep to completely remove the modem from your account and to "re-provision" it from scratch. Also ask them to confirm that the provisioning and account data in their database is correct and complete.
pete_macgregor, I'd be happy to take a look at your modem's provisioning errors on the back end. Thanks for taking the time to post here! Please send me a private message with your full name for help. Just click my name and then on the next page, you'll see an option to send me a private message on the top right hand side.