install chocolatey with windows auth proxy

gistfile1.ps1

Set-ExecutionPolicy -ExecutionPolicy Unrestricted;$a=new-object net.webclient;$a.proxy.credentials=[system.net.credentialcache]::defaultnetworkcredentials;$a.downloadstring('http://bit.ly/OKgXHP')|iex

Here is how to call this from an Administrator Powershell window:

$a=new-object net.webclient;$a.proxy.credentials=[system.net.credentialcache]::Defaultnetworkcredentials;$a.down
loadstring('http://bit.ly/OKgXHP')|iex

And this works on a non-proxied network as well correct?

Excellent! Works fine for me inside a proxy.

This worked for me:

@PowerShell -NoProfile -ExecutionPolicy unrestricted -Command "$wc=new-object net.webclient; $wp=[system.net.WebProxy]::GetDefaultProxy(); $wp.UseDefaultCredentials=$true; $wc.Proxy=$wp; iex ($wc.DownloadString('https://chocolatey.org/install.ps1'))" && SET PATH=%PATH%;%systemdrive%\chocolatey\bin

what if i need not default system proxy?

Perfectly!