BUG #7738: Installer takes hours running icacls

The following bug has been logged on the website:

Bug reference:      7738
Logged by:          dnd
Email address:      dnd1066@gmail.com
PostgreSQL version: 9.2.2
Operating system:   Windows 8
Description:        =


The installer is trying to change access permissions on every directory in
the drive where i've put the data directory, which is not the system drive.