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If Windows Media Player is still installed, you can play a video on loop and minimize it (the sample "Wildlife" videos work fine for this). By default, as long as a video is playing, the screen won't lock.

Yet another option is freeware Caffeine program. It is free for commercial use as well. From the program's homepage:

If you have problems with your PC locking or going to sleep, caffeine will keep it awake. It works by simulating a key-press once every 59 seconds, so your machine thinks you're still working at the keyboard, so won't lock the screen or activate the screensaver.

Caffeine works by simulating an F15 key up event every 59 seconds. Of all the key presses available, F15 is probably the least intrusive (I've never seen a PC keyboard with that key!), and least likely to interfere with your work.

This off-the-shelf solution also allows you to control when to enable it and disable it:

Double-clicking the program icon empties the coffee pot, which is what the icon represents, and temporarily disables the program. Double-clicking it again refills the pot, and will keep your machine awake.

You can create an AutoIt script to either continually press an unused key (e.g. make it toggle the num lock, scroll lock), sleep for a minute or so, and repeat. Alternatively, if you use the keyboard a lot, you could make it move the mouse by a pixel or so in any direction.

If you don't want it continually running, you could also launch the script as a scheduled task (if you have access) to launch after the computer has been inactive for some time.

And this is a very simple script to perform an invisible mouse move, if you don't want to get into AutoIt syntax:

While True

   Local $pos = MouseGetPos()

   MouseMove($pos[0]-1, $pos[1]-1, 0)

   MouseMove($pos[0], $pos[1], 0)

   Sleep(540000)

WEnd

This script moves mouse cursor by one pixel in the up-left direction and after that returns it back, then sleeps for 9 minutes (540000 milliseconds). When script is running, you can see AutoIt icon in the tray. You can stop it right-clicking this icon and choosing the corresponding option.

To make a script, install AutoIt, right-click in any folder and choose New > AutoIt v3 Script, name it, right-click this new script, choose Edit, paste the code provided above and save. You can even compile it to .exe (again, from context menu) to start, for example, from Windows Scheduler.

Compile this in Visual Studio or C# Express and run it from a command prompt (or double click it). Requires .NET 4.0 or above. It does everything you are looking for.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.ComponentModel;

using System.Data;

using System.Diagnostics;

using System.Threading;

using System.Runtime.InteropServices;

using System.Windows.Forms; 



namespace ImWorkin

{

    class Program

    {

        [FlagsAttribute]

        public enum EXECUTION_STATE : uint

        {

            ES_SYSTEM_REQUIRED = 0x00000001,

            ES_DISPLAY_REQUIRED = 0x00000002,

            ES_CONTINUOUS = 0x80000000

        }

        public SYSTEMTIMEOUTS TimeOuts

        {

            get { return sysTimeouts; }

        }

        public struct SYSTEMTIMEOUTS

        {

            public int BATTERYIDLETIMEOUT;

            public int EXTERNALIDLETIMEOUT;

            public int WAKEUPIDLETIMEOUT;

        }



        [DllImport("USER32.DLL", CharSet = CharSet.Unicode)]

        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);



        [DllImport("USER32.DLL")]

        public static extern bool SetForegroundWindow(IntPtr hWnd);



        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]

        static extern EXECUTION_STATE SetThreadExecutionState(EXECUTION_STATE flags);



        [DllImport("user32.dll", SetLastError = true, EntryPoint ="SystemParametersInfo")]

        internal static extern int SystemParametersInfo(int uiAction, int uiParam, ref int pvParam, int fWinIni);



        private static System.Threading.Timer preventSleepTimer = null;

        public const int SPI_GETBATTERYIDLETIMEOUT = 252;

        public const int SPI_GETEXTERNALIDLETIMEOUT = 254;

        public const int SPI_GETWAKEUPIDLETIMEOUT = 256;

        public static int Counter = 0;

        public static int timeOutinMS = 0;

        public static int batteryIdleTimer;

        public static int externalIdleTimer;

        public static int wakeupIdleTimer;

        public static SYSTEMTIMEOUTS sysTimeouts;





        static void Main(string args)

        {

            Console.WriteLine("You are about to be workin!! Just a moment...I need to calculate a few values.");

            string dots = string.Empty;

            for (int i =2; i < 60; i++)

            {

                dots = "";

                for (int ii = 0; ii < i; ii++)

                {

                    dots = dots + ".";

                }

                Thread.Sleep(100);

                Console.Clear();

                Console.WriteLine("You are about to be workin!! Just a moment...I need to calculate a few values.");

                Console.WriteLine(dots);

            }





            GetSystemTimeOuts();





            if (timeOutinMS < sysTimeouts.BATTERYIDLETIMEOUT)

                timeOutinMS = sysTimeouts.BATTERYIDLETIMEOUT;

            if (timeOutinMS < sysTimeouts.EXTERNALIDLETIMEOUT)

                timeOutinMS = sysTimeouts.EXTERNALIDLETIMEOUT;

            if (timeOutinMS < sysTimeouts.WAKEUPIDLETIMEOUT)

                timeOutinMS = sysTimeouts.WAKEUPIDLETIMEOUT;



            if (timeOutinMS == 0)

                timeOutinMS = 30;



            DisableDeviceSleep();

            Console.WriteLine("");

            Console.WriteLine("");

            Console.WriteLine("OK. I have calculated your computers timeout periods and set the   ");

            Console.WriteLine("necessary hooks. Your computer will not shut off the monitor, will");

            Console.WriteLine("show active in any chat programs,the screensaver is disabled and ");

            Console.WriteLine("the computer will not lock! Anyone looking at you eaither locally ");

            Console.WriteLine("or remotely will think you are hard at work.");

            Console.WriteLine("");

            Console.WriteLine("Now go do something fun...I got your back ;)");

            Console.WriteLine("Oh yeah....if you close this window OR press `q' in this ");

            Console.WriteLine("window you are going to have to actually work.");

            Console.WriteLine("");

            Console.WriteLine("");

            Console.WriteLine("This text will disappear in a 30 seconds. Just in case someone comes ");

            Console.WriteLine("by and reads your screen!");

            Console.WriteLine("");

            Console.WriteLine("");

            Console.WriteLine("Need custom coding? Kenneth.gore@gmail.com");

            while (Console.KeyAvailable == false)

            {

                Thread.Sleep(250);

                ConsoleKeyInfo cki = Console.ReadKey(true);



                if (cki.KeyChar == 'q')

                    break;

            }



        }





        public static void DisableDeviceSleep()

        {

           SetThreadExecutionState(EXECUTION_STATE.ES_SYSTEM_REQUIRED | EXECUTION_STATE.ES_DISPLAY_REQUIRED | EXECUTION_STATE.ES_CONTINUOUS);

           preventSleepTimer = new System.Threading.Timer(new TimerCallback(PokeDeviceToKeepAwake), null, 0, timeOutinMS * 1000);

        }



        public static void EnableDeviceSleep()

        {



           preventSleepTimer.Dispose();

           preventSleepTimer = null;



        }



        private static void PokeDeviceToKeepAwake(object extra)

        {



            Counter++;

            try

            {

                   SetThreadExecutionState(EXECUTION_STATE.ES_SYSTEM_REQUIRED | EXECUTION_STATE.ES_DISPLAY_REQUIRED | EXECUTION_STATE.ES_CONTINUOUS);

                   IntPtr Handle = FindWindow("SysListView32", "FolderView");



                   if (Handle == IntPtr.Zero)

                   {

                       SetForegroundWindow(Handle);

                       SendKeys.SendWait("%1");

                   }



                   if (Counter > 1)

                       Console.Clear();

            } 

            catch 

            {



            }

        }



        public static void GetSystemTimeOuts()  

        {

            sysTimeouts.BATTERYIDLETIMEOUT = -2;

            sysTimeouts.EXTERNALIDLETIMEOUT = -2;

            sysTimeouts.WAKEUPIDLETIMEOUT = -2;





            if (SystemParametersInfo(SPI_GETBATTERYIDLETIMEOUT, 0, ref batteryIdleTimer, 0) == 1)

                sysTimeouts.BATTERYIDLETIMEOUT = batteryIdleTimer;

            else

                sysTimeouts.BATTERYIDLETIMEOUT = -1;



            if (SystemParametersInfo(SPI_GETEXTERNALIDLETIMEOUT, 0, ref externalIdleTimer, 0) == 1)

                sysTimeouts.EXTERNALIDLETIMEOUT = externalIdleTimer;

            else

                sysTimeouts.EXTERNALIDLETIMEOUT = -1;







            if (SystemParametersInfo(SPI_GETWAKEUPIDLETIMEOUT, 0, ref wakeupIdleTimer, 0) == 1)

                sysTimeouts.WAKEUPIDLETIMEOUT = wakeupIdleTimer;

            else

                sysTimeouts.WAKEUPIDLETIMEOUT = -1;





        }

    }

}

There is an android app called "Timeout Blocker" that vibrates at an interval and you can put your mouse on it. It says not to use it at work though. https://play.google.com/store/apps/details?id=com.isomerprogramming.application.timeoutblocker&hl=en

In my case just this one line did the trick:

SendKeys.Send("{CAPSLOCK}");

Just put it in the Timer_Tick event and set timer interval to e.g. 60000ms.

Mouse Jiggler might be an option:
https://mousejiggler.codeplex.com/

I like to use easy and integrated options (no additional software), like a powershell script (thanks https://dmitrysotnikov.wordpress.com/2009/06/29/prevent-desktop-lock-or-screensaver-with-powershell/) that uses the "f15" as the key to success (thx to caffeine. It's indeed least interfering)

param($minutes = 180)



write "... screen will be awake for $minutes"



 $myshell = New-Object -com "Wscript.Shell"



 for ($i = 0; $i -lt $minutes; $i++) {

 write "... screen will be awake for" ($minutes-$i)

 Start-Sleep -Seconds 60    

 $myshell.sendkeys("{F15}")

}

Put this into a myScriptName.ps1 and start it via desktop shortcut or commandline:
C:WindowsSystem32WindowsPowerShellv1.0powershell.exe -nop "C:UsersmyUserDesktopmyScriptName.ps1"

UPDATE:
Maybe there was some change from the administrator, but this doesn't work for me anymore
Now I have to use an autohotkey-script from NBirnel: https://github.com/nbirnel/nosleep - this work perfect, because it moves the mouse (without distracting any work)

The correct way to handle it is to:

• go into the registry where the policy is


• set the value to whatever you want


• and alter the registry key permissions


• only Deny write access to anyone except yourself