Well, Tom Kyte has some suggestions which may give some clues: http://asktom.oracle.com/pls/asktom/f?p=100:11:0::NO::P11_QUESTION_ID:431775600346873836 (AskTom is a very useful resource if you've not seen it before). I was going to ask if the windows service for the database is started (i.e. not just the listener service) but the listener status you posted earlier suggests it is. It would be worth checking you can connect in the same way with the same credentials directly on the db server first. I'm not quite sure about sysoper as I don't use that - you could try also connecting as a regular user, e.g. scott/tiger or hr if you have example schemas installed (you will need to unlock the accounts first: ALTER USER scott ACCOUNT UNLOCK).
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