Can anyone help me with this-"network adaptor failed to connect"

hi,
i just starting to learn oracle..so installed oracle 11g R2 and sql developer on my laptop..when i tried to connect to the database i get this error
"network adaptor failed to connect"..
help will be thankful..

Welcome to the forums !
What is the OS ? 11gR2 is only supported on Win 7 - http://download.oracle.com/docs/cd/E11882_01/install.112/e10843/reqs.htm#CHDHGGFE
HTH
Srini

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