The following bug has been logged online:

Bug reference: 2860
Logged by: Robert Kuhar
Email address: maxdigitalstudio (AT) yahoo (DOT) com
PostgreSQL version: 8.2
Operating system: windows xp
Description: can't install the software
Details:

I'm running 700MHz Athlon with 128 MB RAM. I follow all the rules for the
installation, however, when the proces gets to creating the account is halts
with following message: Internal account lookup failure: No mapping between
account names and security IDs was done. I tried version 8.14 with same
results

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