try to login connect sys as sysdba password is either oracle or change_on_install, if you will successfull then log out and try to connect as scott/tiger.
if you are unable to login as sys also, check the services from net start. if not start the services.
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Sleight of hand and twist of fate...
On a bed of nails she makes me wait...
And I wait without you ...
With or without you ..
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Batty = Too Busy Now !!!