How to solve IO ERROR:THE NETWORK ADAPTER COULD NOT ESTABLISH THE CONNECTION?

Go to Start in your computer, type services

Go to services[select standard among Extended and standard] and start[right click on service and click start]
1.Oracle ORCL VSS writer Service
2.OracleDBConsole
3.OracleMTSRecovery Service
4.OracleOraDb11g_Home1ClrAgent
5.OracleOraDb11g_Home1TNSListener
6.OracleServiceORCL

Now connect the connection in Oracle SQL Developer by using username and password.
Eg:Username:hr
Password:hr