Global proxy settings for all Windows applications in Windows Vista

The short answer is: you can't. There is no "global" proxy setting, because proxies are used by individual applications (like Internet Explorer, Firefox, etc.), not by Windows itself. However, some programs internally use Internet Explorer libraries to access the web, so they will use the IE setting, as posted by firedfly. You can force individual applications to use proxies, even if the applications themselves don't support proxies, by using tools such FreeCAP or Socksify. If you really do wan…