Apparently there are some issues when activating Autodesk 2014 products. I never experience the issue, but there are two issues I found about this. Both are hardware related.
Image source: Autodesk knowledge base
Computer’s BIOS doesn’t have serial number
You can check if this is your problem in this knowledge base: http://usa.autodesk.com/getdoc/id=TS21825687.
You will also find the solution there.
Problems on laptops with Geforce GT cards
Apparently having Geforce GT card and integrated Intel ® HD graphics is not a good idea, if you intend to use your laptop for CAD. I’ve seen some issues in the past like this one, and now this issue with product activation.
If your laptop has those two graphic cards, check this post on Up and Ready for the solution.
Do you have other problem when activation 2014 product?
If you do please let me know. If you already have the solution, it would be better. People will it useful!