Connection refused error message after ip change

hello

 i have windows server with pgsql-9.2  for ca wily interscope.
i change the ip address in the server, and from that point the psotgressql
is not working.
i uninstall the sql+wily and install in again, and it only install the wily
and not the sql.
i get error message:
Connection refused. Check that the hostname and port are correct and that
the postmaster is accepting TCP/IP connections.

my windows firewall service is disabled.

what can be to problem



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