Unable to start postgres server

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http://serverfault.com – This happened after i modified the pg_hba.conf file. It is currently set on trust but the server still asks for a password (even tho when clicking properties the password field is disabled ) . I treied restarting and now the damn thing wont start at all (the server that is; i have no postgres processes now). I also installed postgres 9.0 now and it works . But i would realy like to regain access to the old server. I have also tried a solution involving resetxlog -f but to no avail Here is what else i tried : E:\Program Files\PostgreSQL\8.4.8\bin>pg_ctl.exe start -N "postgresql-8.4.8" -D (HowTos)