How to open new connection in Oracle SQL Developer ???

Hi folks,
I have installed SQL Developer Version 1.5.0.53 in a XP sp2 system. tried to open a Database Connection, with OR_OHCL connection name and 'hr' username & password, but when I click on Connect it showed me "Failure- Io Exception The network adapter could not establish the connection". How can i resolve this issue?
Thanks in adavance. I need urgent reply, if not lot of replies!!!

i need to mention that i have never used SQL Developer before. but i have done some oracle coding 1year ago when i had Oracle 9i installed in my computer. but i don't have any oracle installed in my computer. do i need to install any for using SQL Developer? i am not sure what to do?
i want to use it for just learning. if i need to install Oracle DB which one do you guys suggest me to install ---
1.Oracle Database 10g Express Edition (Western European)
2.Oracle Database 10g Express Edition (Universal)
3.Oracle Database 10g Express Client
4. or anything else
please help me out.
Sarwar

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Message was edited by:
bazzza

How to open new connection in Oracle SQL Developer ???

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