Server doesn't accept connection

Hi,

i'm new user i'm this problem:

My database Pgadmin III up to yesterday connect, tomorrow display this
message:
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?

I'm scanning pc with antivirus, it's ok.
I'm not delete users or made changes.
My version of Postgres è 9.1.3-1

I change the date, i'm rename directory log, i'm reinstall version of
postgres...

Help my please.

Fra2012



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