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Please, can you copy and paste all the screen of your console.
Also what version and edition of Oracle are you using and version of Windows (even x64 or x32 bits)
How about your OS's FW??
SQL*Plus Release 126.96.36.199.0 Production on Thu Jan 3 13:41:30 2013
Copyright <c> 1982, 2010, Oracle. All rights rights reserved.
Enter user-name: system
ORA-12170: TNS:Connect timeout occured
OS:Microsoft Windows XP, 32X
Could you turn off the firewall in Windows XP?
Or can you log in as sysdba?