I am able to give a prompt to the user using powershell script but the issue is that the user is able to ignore it. What I mean is the user is able to open other programs and file even when the prompt is there. I want that when the user is prompted he should not be able to open any other app or file until he reacts to the prompt.

`Add-Type -AssemblyName System.Windows.Forms

$result = [System.Windows.Forms.MessageBox]::Show(
    "Do you want to change the BIOS password?",
    "BIOS Password Change",
    [System.Windows.Forms.MessageBoxButtons]::OKCancel,
    [System.Windows.Forms.MessageBoxIcon]::Question
)
if ($result -eq [System.Windows.Forms.DialogResult]::OK) {
$form = New-Object System.Windows.Forms.Form
$form.Text = "Change BIOS Password"
$form.Size = New-Object System.Drawing.Size(320,220)
$form.StartPosition = "CenterScreen"


$labelOld = New-Object System.Windows.Forms.Label
$labelOld.Location = New-Object System.Drawing.Point(10,20)
$labelOld.Size = New-Object System.Drawing.Size(280,20)
$labelOld.Text = "Enter old BIOS password:"
$form.Controls.Add($labelOld)
$textboxOld = New-Object System.Windows.Forms.TextBox
$textboxOld.Location = New-Object System.Drawing.Point(10,40)
$textboxOld.Size = New-Object System.Drawing.Size(260,20)
$form.Controls.Add($textboxOld)


$labelNew = New-Object System.Windows.Forms.Label
$labelNew.Location = New-Object System.Drawing.Point(10,70)
$labelNew.Size = New-Object System.Drawing.Size(280,20)
$labelNew.Text = "Enter new BIOS password:"
$form.Controls.Add($labelNew)
$textboxNew = New-Object System.Windows.Forms.TextBox
$textboxNew.Location = New-Object System.Drawing.Point(10,90)
$textboxNew.Size = New-Object System.Drawing.Size(260,20)
$form.Controls.Add($textboxNew)

$button = New-Object System.Windows.Forms.Button
$button.Location = New-Object System.Drawing.Point(75,130)
$button.Size = New-Object System.Drawing.Size(75,23)
$button.Text = "OK"
$button.DialogResult = [System.Windows.Forms.DialogResult]::OK
$form.Controls.Add($button)

$form.Add_Shown({
    $textboxOld.Select()
})
$form.AcceptButton = $button

$result = $form.ShowDialog()

if ($result -eq [System.Windows.Forms.DialogResult]::OK) {
    $oldPassword = $textboxOld.Text
    $newPassword = $textboxNew.Text
    (gwmi -Class Lenovo_SetBiosPassword -Namespace rootwmi).SetBiosPassword("pap,$oldPassword,$newPassword,ascii,us")
    [System.Windows.Forms.MessageBox]::Show(
        "Restart your device to see the changes",
        "Operation Cancelled",
        [System.Windows.Forms.MessageBoxButtons]::OK,
        [System.Windows.Forms.MessageBoxIcon]::Exclamation
    )
 
} else {
    [System.Windows.Forms.MessageBox]::Show(
        "Password change cancelled.",
        "Operation Cancelled",
        [System.Windows.Forms.MessageBoxButtons]::OK,
        [System.Windows.Forms.MessageBoxIcon]::Exclamation
    )
}
} else {
    [System.Windows.Forms.MessageBox]::Show(
        "Password change cancelled.",
        "Operation Cancelled",
        [System.Windows.Forms.MessageBoxButtons]::OK,
        [System.Windows.Forms.MessageBoxIcon]::Exclamation
    )
}`

This is the powershell script I used to give a prompt to the user to change the bios password.But the user is able to ignore this prompt. He should react to this prompt before accessing any other file.