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What product? What operating system? A 1603 error indicates that the software didn't install. That is a very generic error code.
I wrote an article about this issue.
Basically, you can install your software from the virtual assistant instead and be good to go:
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=21889745&linkID=9240617
Good Luck!