Unattended setup

try the microsoft support site

http://support.microsoft.com/support/kb/articles/Q181/4/13.ASP?LN=EN-US&SD=gn&FR=0

Yes, Proxy server requires IIS to be present on the machine before you install it. Here's a step-by-step guide to installing Proxy 2.0: http://www.windows2000faq.com/Articles/Index.cfm?ArticleID=14647&Key=Proxy%20Servers

There are two modes of acquiring knowledge, namely by reasoning and experience. Reasoning draws a conclusion and makes us grant the conclusion, but does not make the conclusion certain, nor does it remove doubt so that the mind may rest on the intuition of truth, unless the mind discovers it by the path of experience.

- Roger Bacon