Cannot start the PostgreSQL service

Hello.  Sorry if I have sent this to too may mail boxes.  I hope one of them is correct.  Please forward this on if not.
 
This was working until recently.  In Services I right clicked on properties and I think I changed the METHOD in pg_hba.conf from md5 to trust.
I think after making this change the problems started.
 
In Services I cannot start the PostgreSQL Server 8.4 due to Error:1069 The service did not start due to a logon failure.
 
I have tried to set up pg_hba.conf correctly.  Currently it is set to the following -
 
# TYPE  DATABASE    USER        CIDR-ADDRESS          METHOD
# IPv4 local connections:
host    all         all         127.0.0.1/32          trust
host    all         all         192.168.1.1/5432      trust
# IPv6 local connections:
host    all         all         ::1/128               trust
 
I have tried to set up pgpass.conf correctly as this was empty.  Currently set to the following -
 
127.0.0.1:5432:*:postgres:dbpass
 
The errors remain.  Also I have been getting the error "could not connect to Server: Connection refused" detailed below -
 
http://www.pgadmin.org/docs/1.14/connect-error.html
 
I wanted to reload the configuration (before attempting to start the Service again ) and I got the error "Reload command returned an error (1)".
 
I am not sure what to try next.  I have some databases I do not want to lose if I can avoid it. 
 
Any ideas?
 
Thanks, Dave.