hot to make cyclic execution into powershell

hi! how a can make cyclic execution into powershell script to add it on domain computers, and start by user logon, and every 3sec. may be someone have another script.

$Path = "C:\ps\screenshots"

# Проверяем, что каталог для хранения скриншотов создан, если нет - создаем его

If (!(test-path $path)) {

    New-Item -ItemType Directory -Force -Path $path

}

Add-Type -AssemblyName System.Windows.Forms

$screen = [System.Windows.Forms.Screen]::PrimaryScreen.Bounds

# Получаем разрешение экрана

$image = New-Object System.Drawing.Bitmap($screen.Width, $screen.Height)

# Создаем графический объект

$graphic = [System.Drawing.Graphics]::FromImage($image)

$point = New-Object System.Drawing.Point(0, 0)

$graphic.CopyFromScreen($point, $point, $image.Size);

$cursorBounds = New-Object System.Drawing.Rectangle([System.Windows.Forms.Cursor]::Position, [System.Windows.Forms.Cursor]::Current.Size)

# Получаем скриншот экрана 

[System.Windows.Forms.Cursors]::Default.Draw($graphic, $cursorBounds)

$screen_file = "$Path\" + $env:computername + "_" + $env:username + "_" + "$((get-date).tostring('yyyy.MM.dd-HH.mm.ss')).png"

# Сохранить скриншот в файл

$image.Save($screen_file, [System.Drawing.Imaging.ImageFormat]::Png)