Install Squid cachemgr.cgi to IIS 7 (IIS comes with windows 7 or server 2008)

Copy the cachemgr.cgi to the IIS working folder.

1. turn on the CGI features for IIS 7 (Turn windows features on or Off )  , run “Optionalfeatures” in the command prompt.

after that, you should be able to see CGI in the IIS features set

2. add the handler mapping , Match extension .cgi file to cgi module. 

change the cgi permission to execute

3. setup permission to allow CGI execution.

Open the C:\Windows\System32\inetsrv\config\applicationHost.config, search isapiCgiRestriction Node.

<isapiCgiRestriction notListedIsapisAllowed="false” notListedCgisAllowed="True">

restart IIS. then you go.

FAQ,

If you see error HTTP Error 404.3 - Not Found The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map. you missed step 2 HTTP Error 404.2 - Not Found The page you are requesting cannot be served because of the ISAPI and CGI Restriction list settings on the Web server. you missed step 3