Go to start up Maximizer on one particular work station and get this message. The other work stations have no issues.
The first step would be to check that the SQL Server instance that hosts your Maximizer database is actually running. You can do this by following these steps on the SQL Server Box:
If these services are running then I would expect the problem is that the computer which is running Maximizer cannot reach the computer which is running SQL over the network.
This article suggest some steps to take to resolve SQL connectivity issues: