Automatically use saved proxy authentication on Windows

Automatically use saved proxy authentication on Windows

Is there some method to prevent Windows (or the browser) from popping up
the proxy authentication dialog every time I open a browser? Surely there
should be some setting to use my user name and password automatically?
The saved information does appear in the pop-up authentication window, I
want to avoid the pop-up entirely (since it serves no purpose, and gets
annoying as I have to click it hundreds of times)
Note that I have no access to the proxy server itself, or know what type
it is.
In case this information is necessary - Wireshark shows the following
CONNECT www.google.com:443 HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:23.0) Gecko/20100101 Firefox/23.0
Proxy-Connection: keep-alive
Connection: keep-alive
Host: www.google.com
HTTP/1.1 407 Proxy Authentication Required
Proxy-Authenticate: BASIC realm="InetPass"
Cache-Control: no-cache
Pragma: no-cache
Content-Type: text/html; charset=utf-8
Proxy-Connection: close
Set-Cookie: BCSI-CS-e9e87a9198535326=2; Path=/
Connection: close
Content-Length: 1785
(HTML page follows, displayed if authentication fails)
Thanks in advance