Setup of PGAdmin

I know that the setup for pgadmin is pretty simple.  I have MDC 2.1
installed, I have postODBC installed, and I have pgadmin installed. 
However when I try to access a database I continue to get error message
that states:

"The selected database is not a PostgreSQL v6.5.x system!"

However, I am using 6.5.5

On the subsequent tries I get: 

"This database does not appear to be in the version 6.4.x format!"

I was reading through the documentation for postODBC and noticed that I
have to have pg_hba.conf to allow remote access and I must start postmaster
-i 

Will this fix the above problems?

Thank you,

Kenneth Swift
swift@eturnkey.com