The following bug has been logged online:

Bug reference: 2275
Logged by: Davorin Vlasic
Email address: davorin (AT) ilovejackdaniels (DOT) com
PostgreSQL version: 8.1.3
Operating system: Windows XP (SP2)
Description: Installation fatal error
Details:

Intaller silently ends after first screen (lang selection=english). My OS
has only one locale (Croatian). Adding English locale resulted same error.

Install log:
MSI (c) (A4:A4) [09:46:05:953]: Note: 1: 2769 2: GetAvailableLocales 3: 1
MSI (c) (A4:A4) [09:46:05:953]: Note: 1: 2205 2: 3: Error
MSI (c) (A4:A4) [09:46:05:953]: Note: 1: 2228 2: 3: Error 4: SELECT
`Message` FROM `Error` WHERE `Error` = 2769
DEBUG: Error 2769: Custom Action GetAvailableLocales did not close 1
MSIHANDLEs.
The installer has encountered an unexpected error installing this package.
This may indicate a problem with this package. The error code is 2769. The
arguments are: GetAvailableLocales, 1,
Action ended 9:46:05: GetAvailableLocales. Return value 1.
MSI (c) (A40) [09:46:05:984]: Doing action: CheckAvailableDLLs
Action 9:46:05: CheckAvailableDLLs.

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//Magnus

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TIP 2: Don't 'kill -9' the postmaster