The following bug has been logged online:

Bug reference: 2066
Logged by: apco
Email address: apcoder (AT) gmail (DOT) com
PostgreSQL version: 8.1
Operating system: Windows XP with sp2
Description: installer error: code 2755.
Details:

Postgresql MUI wrapper: can't find specified device or file. error code 2755

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TIP 5: don't forget to increase your free space map settings