The error you got Oracle not available could be because The SGA requires more space than was allocated for it or The Operating-System variable pointing to the instance is improperly defined, well, thats too technical so forget it, when you start SQL PLUS go to Services in Administrative Tools in Control Panel and check whether these services are running Oracle TNS Listener and Oracle Service[name of the database which you must have given at the time of installation. I hope this solves your problem.......
Regards
M
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