One of the things you can do in Task Manager is end processes that are running on a computer. However, what if you are concerned about users ending important processes such as anti-virus software? In such cases, you can use the Group Policy Editor to disable access to Task Manager.
While logged on as an administrator, click Start and select Run. Type gpedit.msc and click OK. Within the Group Policy Editor console, navigate to the following location:
User Configuration \ Administrative Templates \ System \ CTRL+ALT_Del Options.
In the details pane, double click the Remove Task Manager option.
Click Enabled and click OK.
If you need to launch Task Manager, you can still do so by using the executable found within the C:\Windows\System32 directory. If necessary, use the Run As command. However, any users without the Administrator password will not be able to run the program.