Hi Rubem,
You mention a reinstall. Did you run the 'Configure' action from the Service Management installer after the reinstall? Check your ODBC connections - is there a System DSN named 'casd_your-SDM-hostname'?
You will probably find both a 32-bit and a 64-bit DSN. Test each from the relevant ODBC manager (the 32-bit manager and the 64-bit manager), giving 'servicedesk' as the userid and using the privileged user password. Can you connect?
Once the DSNs test OK, open Universe designer and Import the CA Service Desk universe. When the universe has imported, look at File / Parameters and check the Connection. Is it 'casd_your-SDM-hostname'? If not, change it. Test the connection. When you get a successful test, if you have edited the universe connection, Save the universe then Export it back to CABI. Then see if you can run a report.
Hope that helps :-)
Regards,
James