2 knedlik:
Go to the c:\program files\postgresql\8.2\data folder. Is there a file called postmaster.pid there? If so, rename it to anything you want to and restart the computer.
If it still doesn't work, go to the Start menu and select Settings > Control Panel > Administrative Tools > Services.
Find PostgreSQL 8.2 Database Server in the list. Does it say it's started? If not, try to start it. What happens? Does it give an error?
И да, попробуй удалить пользователя постгре так, как предлагалось чуть выше.