installation

I'm having trouble installing postgreSQL-8.0

I accidently set it to generate an automatic password during set-up. I
wanted to generate my own password, so I exited the set-up, and now it
says invalid username/password, login denied.

How can I fix this?

Thanks.


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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match