Restrict users loading programs

Make them Limited Users when you set up their user account. Limited account users cannot install software.

The above answer is correct. To achieve what you are looking for the user should not be setup as Administrators or Power Users. You can set up the user account through, control panel, admin tools, computer management, local users and groups. Find the user acccount they are logging in with, right click and choose properties, check the group they belong to. Here you can change the group to the appropiate one, probably users. But you should really take note of what the users requirements are (if you are on a network,etc) before changing their group.

Good idea, however have run into the problem of allowing updates but restricting software installs. No real workaround that I know of, this will cause update deployment problems. (ie: virus definitions, windows updates).

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