how to fix this error ? please help

[naved momin]

hi till yesterday my sql server was running fine
but at night i have tried to do certern thing to make ms sql driver 3.0 works but it didnt and i have to continue with jdbcodbc driver
in morning i have restored all the changes that i have made but and when i try to run the database code from my netbeans it started giving an error
then i look at the sql server configuration manager and restored all the changes by seing in my laptop because it is working fine in my laptop but still after doing this much it is giving an error can anyone help please

java.sql.SQLException: [Microsoft][ODBC SQL Server Driver][Shared Memory]Invalid connection.