BUG #6194: Cannot install any of the installers

The following bug has been logged online:

Bug reference:      6194
Logged by:          Pradeep D
Email address:      pradeep.dharmavarapu@live.com
PostgreSQL version: all
Operating system:   Windows 7 64 bit SP1
Description:        Cannot install any of the installers
Details:

I keep getting these errors -
1. Unable to write inside TEMP environment variable path
2. An error occured executing the Microsoft VC++ runtime installer

The first message is with 9.x installer version and the second is with 8.x
versions.

I am the admin on my machine.

I also have Windows Scripting active and also disable my antivirus and
firewall while installing these packages.

Please help with any instructions to fix this issue.