Database Error 101

My PT2 has gotten a little out of whack. I tried reinstalling postgres but I made it worse.
Now I get this when I open PT2:
Database Error
Unable to connect to the database
101 - SQLSATE = 08001
FATAL: password authentication failed for user "postgres"
Please help. Thanks.
Now I get this when I open PT2:
Database Error
Unable to connect to the database
101 - SQLSATE = 08001
FATAL: password authentication failed for user "postgres"
Please help. Thanks.