The following bug has been logged on the website:
Bug reference: 8219
Logged by: Matthew King
Email address: matt7416@gmail.com
PostgreSQL version: 9.2.4
Operating system: Windows 7 (64-bit)
Description: =
I attempted to install PostgreSQL 9.2.4, but the installer failed with
"Invalid %COMSPEC%". I checked the installer log. It appears the reason for
failure was that my username ("Matt (2)") contains spaces.