I am the network administrator of my office and I am facing some issues during administration. I have about 50 users in the network and many of them have started fishy things on their computers. I want to delete their accounts at a time and keep an account called as Administrator and also All Users. There should not be any other account on those computers except what I have stated. My network consists of Windows XP and Windows Vista, and I have Windows 2008 Server. So can I restrict those users to open specific applications because that is creating a lot of issues? Please help!