server doesnt listen

can any one suggest any steps to be taken for the server does not listen
problem???
i had postgresql8.3 from which i upgraded to 9.0. version 8.3 was working
fine. but after this upgrade i have been facing this problem.

when i first installed 9.0 a user account was created. but then when i
reinstalled the documents and setting does show a user created for postgre
but that is not visible in the windows logon screen. can that be the
problem..

On connecting to the server directly from the pgAdmin3 it shows the message
that the server does not listen.

but when i start the service from Control Panel>Admin Tool> Services. it
does start up with out any issues.
but then when i try to restore my database. it does not let me.

The message is::::

pg_restore: connecting to database for restore
pg_restore: [archiver (db)] connection to database "jbook" failed: server
closed the connection unexpectedlyThis probably means the server terminated abnormallybefore or while processing the
request.
pg_restore: *** aborted because of error

Process returned exit code 1.



it would be really helpful if someone could help me out..
Thanks in advance. 
Dhanush.

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