I am using a Windows 7 Pro as OS, after installing Openerp 7, a receive this message. Can some one help me to solve this probleme ?

OpenERP Server Error Client Traceback (most recent call last): File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server\openerp\addons\web\http.py", line 204, in dispatch File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server\openerp\addons\web\controllers\main.py", line 759, in get_list File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server\openerp\addons\web\controllers\main.py", line 89, in db_list File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server\openerp\addons\web\session.py", line 31, in proxy_method File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server\openerp\addons\web\session.py", line 104, in send

Server Traceback (most recent call last): File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server\openerp\addons\web\session.py", line 90, in send File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server.\openerp\netsvc.py", line 293, in dispatch_rpc File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server.\openerp\service\web_services.py", line 122, in dispatch File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server.\openerp\service\web_services.py", line 359, in exp_list File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server.\openerp\sql_db.py", line 484, in cursor File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server.\openerp\sql_db.py", line 182, in __init__ File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server.\openerp\sql_db.py", line 377, in _locked File "C:\Program Files\OpenERP 7.0-20130506-231027\Server\server.\openerp\sql_db.py", line 440, in borrow File "psycopg2__init__.pyc", line 178, in connect OperationalError: could not connect to server: Connection refused (0x0000274D/10061) Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432? could not connect to server: Connection refused (0x0000274D/10061) Is the server running on host "localhost" (127.0.0.1) and accepting TCP/IP connections on port 5432?