The proxy settings for Internet Explorer are stored in the registry in the folder " Software\Microsoft\Windows\CurrentVersion\Internet Settings .
With Powershell (part of Windows since Windows 7) you can use:
set-itemproperty -path "hkcu:Software\Microsoft\Windows\CurrentVersion\Internet Settings" -name ProxyServer -value "http=proxy-url:port;https=proxy-url:port;ftp=proxy-url:port;socks=proxy-url:port;" -type string
This setting only affects Internet Explorer and may require a new tab or even restart IE, although this is unlikely.
Darcara
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