C# Исходник Отключаем TaskBar, Cmd, TaskManager, Regedit, Uac, SmartScreen

namespace WinControl.Helpers
{
    using System;
    using System.Runtime.InteropServices;

    internal static class NativeMethods
    {
        #region Для обновления оболочки Explorer
        [DllImport("user32")]
        public static extern int PostMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam);

        [DllImport("user32", CharSet = CharSet.Unicode)]
        internal static extern IntPtr FindWindow(string className, string caption);

        [DllImport("user32", CharSet = CharSet.Unicode)]
        internal static extern IntPtr FindWindowEx(IntPtr parent, IntPtr startChild, string className, string caption);
        #endregion

        [DllImport("user32.dll")]
        public static extern bool ShowWindow(IntPtr hwnd, int command);
    }
}

namespace WinControl.Helpers
{
    using System;

    public static class WinXplorer
    {
        public static void Refresh()
        {
            IntPtr explorer = NativeMethods.FindWindow("Progman", "Program Manager");
            explorer = NativeMethods.FindWindowEx(explorer, IntPtr.Zero, "SHELLDLL_DefView", null);
            explorer = NativeMethods.FindWindowEx(explorer, IntPtr.Zero, "SysListView32", null);
            NativeMethods.PostMessage(explorer, 0x100, new IntPtr(0x74), IntPtr.Zero);
            NativeMethods.PostMessage(explorer, 0x101, new IntPtr(0x74), new IntPtr(1 << 31));
        }
    }
}

namespace WinControl
{
    using System;
    using System.Management;
    using Helpers;
    using Microsoft.Win32;

    public static class RegControl
    {
        /// <summary>
        /// Метод для проверки битности реестра
        /// </summary>
        private static RegistryView Regview => Environment.Is64BitOperatingSystem ? RegistryView.Registry64 : RegistryView.Registry32;

        public static bool ToogleCmd(bool write)
        {
            const string REG = @"SOFTWARE\Policies\Microsoft\Windows";
            try
            {
                using RegistryKey key = Registry.CurrentUser.OpenSubKey(REG, true); // Открываем раздел реестра для записи
                using RegistryKey sxs = key?.CreateSubKey("System"); // Тут создаём папку System
                sxs?.SetValue("DisableCMD", write ? 1 : 0); // True - Блочит\False - Разблочит
            
                return true;
            }
            catch { return false; } // Тут можно по желанию добавить проверку на доступность
        }
      
        public static bool ToogleUser(bool write, string value)
        {
            const string REG = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Policies";
            try
            {
                using RegistryKey key = Registry.CurrentUser.OpenSubKey(REG, true);
                using RegistryKey sxs = key?.CreateSubKey("System");
                if (value.Equals("Uac", StringComparison.CurrentCultureIgnoreCase))
                {
                    sxs?.SetValue("EnableLUA", 0, RegistryValueKind.DWord);
                    sxs?.SetValue("PromptOnSecureDesktop", 0, RegistryValueKind.DWord);
                }
                if (value.Equals("TaskMgr", StringComparison.CurrentCultureIgnoreCase))
                {
                    sxs?.SetValue("DisableTaskMgr", write ? 1 : 0, RegistryValueKind.DWord);
                }
                if (value.Equals("DisableRegistryTools", StringComparison.CurrentCultureIgnoreCase))
                {
                    sxs?.SetValue("DisableRegistryTools", write ? 1 : 0, RegistryValueKind.DWord);
                }
                return true;
            }
            catch { return false; }
        }
      
        public static bool ToogleTaskBar(bool write)
        {
            const int SW_HIDE = 0, SW_SHOW = 1;
            try
            {
                IntPtr TaskBarHWnd = NativeMethods.FindWindow("Shell_TrayWnd", "");
                if (TaskBarHWnd != null)
                {
                    NativeMethods.ShowWindow(TaskBarHWnd, write ? SW_HIDE : SW_SHOW);
                    const string REG = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer";
                    using RegistryKey registry = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, Regview);
                    using RegistryKey key = registry.OpenSubKey(REG, true);
                    key?.SetValue("TaskbarLockAll", write ? 1 : 0, RegistryValueKind.DWord);
                    WinXplorer.Refresh();
                    return true;
                }

                return false;
            }
            catch { return false; }
        }
      
        public static bool ToogleUac(bool write)
        {
            try
            {
                const string REG = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System";
                using RegistryKey registry = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, Regview);
                using RegistryKey key = registry.OpenSubKey(REG, true);
                key?.SetValue("EnableLUA", write ? 1 : 0, RegistryValueKind.DWord);
                key?.SetValue("PromptOnSecureDesktop", write ? 1 : 0, RegistryValueKind.DWord);
                key?.SetValue("ConsentPromptBehaviorAdmin", write ? 5 : 0 , RegistryValueKind.DWord);
                WinXplorer.Refresh();
                return true;
            }
            catch { return false; }
        }

        public static bool ToogleSmart(bool write)
        {
            try
            {
                const string REG = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer";
                using RegistryKey registry = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, Regview);
                using RegistryKey key = registry.OpenSubKey(REG, true);
                key?.SetValue("SmartScreenEnabled", write ? "on" : "off");
                WinXplorer.Refresh();
                return true;
            }
            catch { return false; }
        }
    }
}

RegControl.ToogleUser(BoxTask.Checked, "TaskMgr"); // Можно через CheckBox ( в данном случае у меня BoxTask) или просто true\false
RegControl.ToogleSmart(BoxSmart.Checked);
RegControl.ToogleUser(BoxReg.Checked, "DisableRegistryTools");
RegControl.ToogleCmd(true);