The following bug has been logged online:

Bug reference: 1424
Logged by: Alberto Monteverdi
Email address: a.monteverdi@tin.it
PostgreSQL version: 8.0
Operating system: Windows 2000 Server SP4
Description: Installer bug
Details:

When the installer try to initialize the database cluster the following
message is visualized:
"Failed to run initdb: 1!
Please see the logfile in
<installation-dir>\tmp\initdb.log
Note You must read/copy this logfile before you click
OK, or it will be automatically removed"

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