The quickest way to configure a standard computer setting that applies to all user profiles, or within a network, is to deploy a group policy setting. To set a group policy, must have access to a user account with administrator rights. There are group policy settings required for things such as configuring an Internet Explorer Web browser to connect through a specified proxy server. Once a group policy setting is configured and in place, it changes the select setting for all user accounts.
Log into a computer using an account with administrator privileges.
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Launch the Group Policy Editor. For Windows XP users, click "Start," then "Run." Type "gpedit.msc" in the box and click "OK." For Windows Vista and 7 users, click the "Start" orb, type "gpedit.msc" in the "Search" box and press "Enter."
In the left window panel, click the plus sign next to the "User Configuration" GPO (Group Policy Object) to expand it. If there is a minus sign next to the GPO, the object is expanded.
Double-click the "Windows Settings" folder in the right window panel. Double-click the "Internet Explorer Maintenance" folder in the right window panel. Double-click the "Connection" folder in the right window panel.
Right-click the "Proxy Settings" policy setting in the right window panel. Select "Properties" from the pop-up shortcut menu. This opens the "Proxy Settings" properties box.
Check the box next to "Enable Proxy Settings."
Enter the proxy server's address, which is a server's URL address or the IP address the URL resolves to, in the appropriate protocol box.
Type the proxy server's port number in the corresponding "Port" box.
Click "Apply" to save and deploy the settings to all user profiles. Click "OK" to close the "Proxy Settings" properties box.
Close the Group Policy Editor.
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Because this is a group policy, these settings will apply to all users on a local computer, or within a network if the policy is deployed from a domain controller.