There are a number of errors that can be generated by the licensing system, this guide help you to solve common license problems.
1.- You have a demo license file.
2.- Ensure that .lic file is correctly installed on c:\windows\system32
3.- If you experience problems with different users than Administrator, ensure that your license file have at least Read permissions assigned to "Everybody" or "Users group".
Go to Windows\System32 and select the license file
Click with right button on "Properties", then select "Security" tab, assign permissions, License files require only "Read" access
See: Manuals