i have Problem Activation AutoCAD 2011 Windows 7
Wrong forum.
http://forums.autodesk.com/t5/Installation-Licensing/Blank-Activation-Screen/td-p/2862508
For more information on this known Autodesk Support Knowledge Base article, please follow this link:
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=6404339&linkID=9240617
this is more likely a internet security problem not a windows 7 problem
you may have to start playing with your internet security options
DarrenP
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Other users have had success running the program as Administrator and activating that way.