Disable Task Manager in C# on the Vista OS

Bryan

Hello everyone. I'm trying to create a secure program in C#, and my hurdle is trying to prevent the user from accessing the Task Manager, to stop them from closing the program and accessing Windows. The problem I've had is all the topics online on how to do this are only texted in XP, and don't work on Vista. So I'm kind of stuck. Can anyone help me please?

18 Replies

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jinge17y ago
Accepted answer
Please check out this article please.

http://tamaspiros.co.uk/2007/12/20/c-disable-ctrl-alt-del-alt-tab-alt-f4-start-menu-and-so-on/

If it helps, please do check "Do you like the answer" please.
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Kenneth16y ago
This works in vista and windows 7, however i replaced CloseWindow() With SendMessage()

this is how

[DllImport("user32.dll")]

        public static extern IntPtr FindWindow(string lpclass, string lpname);

        public const int WM_COMMAND = 0x0112;

        public const int WM_CLOSE = 0xF060;

        [DllImport("user32.dll")]

        public static extern int SendMessage(int hWnd, uint Msg, int wParam, int lParam);

then in the thread, replace the close window with SendMessage(hwndtskm.ToInt32(), WM_COMMAND, WM_CLOSE, 0); then it will close instead of minimizing
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jinge17y ago
Ok, I sent it. Let me know the status.
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Bryan17y ago
My email is [email protected]. Thank you so much.
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jinge17y ago
Hi guy,

I come back. The application tests to be successful in my Vista machine. Let me know your email, I'll send you the solution.

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Bryan17y ago
@Masta Billa

I'm really not sure what you mean. I'm a little confused by what you're telling me to do.

@Jingi

Thank you, I'll be here.
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jinge17y ago
Hello guy, let me start my PC and test it in Vista, and see if it works. Guy, keep observing this post, I'll be Back for at most 1 hour.

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Master Billa17y ago
Hi

use my code to do this,just add this registry code with your c#

In your registry at

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\
System

set DisableTaskMgr value to 1

first you have to create a key in HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\

named: "System" with a subkey(REG_DWORD) named "DisableTaskMgr" with value set to 1

thank you
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Bryan17y ago
I'll try it again. But I've used that code from the link you sent me, and it does not work when I run the EXE as Administrator. I don't know why, but it just doesn't. I do not have experience working with registries, so I don't know what is wrong, and why it won't work.
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jinge17y ago
I often modify registies in Vista using Administrator account, and does not meet any problem. Make sure you do it right.

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Bryan17y ago
I have tried that, and unfortunately I get the same result. It just doesn't work. I know there are lots of restrictions to get around in Vista, but I need to get around those.
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jinge17y ago
Hello guy,

there's much more restrictions when are accessing them in Vista due to high security level. I suggest you run the application under administrator accounts or run as administrator.

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Bryan17y ago
@Jinge

I have seen that article many times. And unfortunately that method of disabling Ctrl Alt Del does not work in Vista. It won't let me access the registry.
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Bryan17y ago
All this ends up doing is minimizing it in the taskbar. And my problem is when it does that, it also exposes the windows task bar to the user, and I can't ever let that happen. If there was a way to have this happen without letting the user see the taskbar that would be great.
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Bryan17y ago
I'm sorry, but this did not work. I was still able to access the Task Manager.
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Kirtan Patel17y ago
ohh ok then its good keep it up guy :) you should create service Application That Prevents to run certain programs :)

please check "do you like this answer" if helps you :)
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Bryan17y ago
It is not for malicious purposes. It is actually for a security program for children to protect them from getting into harmful sections of windows, and browsing websites that can contain unsuitable material. I don't do viruses. :) Thanks.
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Kirtan Patel17y ago
Friend,

Here I m posting code for Make Task Manager Non Usable for User when your program is running in memory

please don't use it in any malicious purpose :) it will work on any windows Version

and check "Do you like answer" please :)

using System.Threading;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication17
{
    public partial class Form1 : Form
    {
        [DllImport("user32.dll")]
        public static extern bool CloseWindow(IntPtr hwnd);

        [DllImport("user32.dll")]
        public static extern IntPtr FindWindow(string lpclass, string lpname);

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Thread t1 = new Thread(CloseTaskMgr);
            t1.Start();
        }

        public static void CloseTaskMgr()
        {
            for (; ; )
            {
               IntPtr hwndtskm = FindWindow(null, "Windows Task Manager");
               CloseWindow(hwndtskm);

            }
         }
    }
}
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