Connecting to Oracle Database 10g Express Edition

Hello guys,
Im running Windows XP SP2.
Ive just installed Oracle SQL Developer and Oracle Database 10g Express Edition.
Im trying to connect via SQL Developer with:
hr/hr (yes, ive unlocked this user)
localhost:1521
sid:orcl
but then it says:
"Status: Failure -Listener refused the connection with the following error:ORC-12505, TNS:listener does not currently know of SID given in connect descript..."
i guess its smth wrong with my SID.
Im total newbie to oracle, keep that in mind.
Please help!

The default SID for Oracle Database 10g Express Edition is XE.

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