Currently Being ModeratedFeb 22, 2013 3:05 PM (in response to stickmanbob0)
1) Are you installing a full version of LE9 or is it an upgrade? If it's an upgrade you will need the previous version.
2) You've quadruple-checked your serial number, but have you checked to make sure that you have not entered any capital Os? These should be zeros; there are no capital Os in serial numbers. This is a very common and understandable mistake.