Hi Mohan,
With reference to your old thread https://www-secure.symantec.com/connect/forums/not-able-upgreade
You are trying to connect existing database, make sure which users have access to sem5 database
Check the properties of database to know the same.
You should consult with SQL admin to reset the password.
If you know the sa password you can use sa credentials as well.
If you are sure it's not password issue then can refer others suggested steps.