When logging into CMEW the Error "Database is not accessible" is issued. This is typically the problem is with an incorrect JDBC driver for the SQL Server.
If both symptoms are present, check the <tomcat>\lib folder. If the following two files are present:
You will need to:
Delete the sqljdbc.jar file from <tomcat>\lib
Delete the sqljdbc.jar file from %EW_HOME%\ew\WEB-INF\lib, if it's present