Database connection fail

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Database connection fail

I have got this error below which is similar with what has posted in forum.

SQL_ERROR (-1) in OdbcConnection::connect
sqlstate=28000, level=-1, state=-1, native_error=18456, msg=[Microsoft][SQL Native Client][SQL Server]Login failed for user 'sa'.

As i have found its solution in this forum. Here I would like to ask since my Ms SQL server epress set up fail due to the error above, but some of the previous setup is successful. In this case, am I going to run the .exe set up to continue the remaining process or I have to uninstall and install it again
Thanks.