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I have installed AutoCAD LT 2012 on my windows 7 Professional 64 bit system and it has been working fine but when I try to register it the error states that I have an invalid serial number????? The serial number on the box and product key are original who do I contact?
This should give you a start:
http://usa.autodesk.com/adsk/servlet/ps/dl/item?id=22021115&linkID=9240617&siteID=123112
Good Luck!