#Requires -Version 5.1
<#
    JbTecWiz Support Centre -- generated fix script

    Fault : STOP 0x00000050 -- PAGE_FAULT_IN_NONPAGED_AREA
    Fix   : Catch the driver with Driver Verifier
    Source: https://jbtecwiz.com/support/win-stop-0x50

    Run as     : Elevated command prompt
    Expect     : 1-2 days of normal use
    Risk       : high
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    Consistently the same code and memory tests clean. Read the rollback
    step BEFORE starting -- Verifier deliberately bugchecks the machine and
    can leave it unbootable.

    HOW TO UNDO IT
    Boot into Safe Mode and run verifier /reset. If Safe Mode will not start
    either, use WinRE -> Command Prompt and run verifier /reset from there,
    or use System Restore.

    This script walks the fix one step at a time and asks before each
    one. Steps with no command are things you do yourself -- it prints
    those and waits. Run with -DryRun to print without executing.

    --------------------------------------------------------------------
    NO WARRANTY - USE AT YOUR OWN RISK

    This script is provided by JbTecWiz as-is and with no warranty of any
    kind, express or implied. You run it entirely at your own risk.

    JbTecWiz accepts no liability for any loss or damage arising from its
    use, including but not limited to data loss, downtime, or configuration
    changes that turn out to be wrong for your system.

    You are responsible for reading this script before running it, for
    satisfying yourself that it suits the machine in front of you, and for
    having a working backup first. Some steps cannot be undone.
    --------------------------------------------------------------------
#>

[CmdletBinding()]
param(
    # Print every step and command without running anything.
    [switch]$DryRun,
    # Do not ask before each step. Read the script first if you use this.
    [switch]$Unattended
)

$ErrorActionPreference = 'Stop'
$script:Failed = 0

function Write-Rule { param([string]$Text)
    Write-Host ''
    Write-Host ('-' * 70) -ForegroundColor DarkGray
    if ($Text) { Write-Host $Text -ForegroundColor Cyan }
}

function Show-Prose { param([string]$Text, [string]$Colour = "Gray")
    if (-not $Text) { return }
    $words = $Text -split "\s+"; $line = "  "
    foreach ($w in $words) {
        if (($line.Length + $w.Length) -gt 74) { Write-Host $line -ForegroundColor $Colour; $line = "  " }
        $line += "$w "
    }
    if ($line.Trim()) { Write-Host $line -ForegroundColor $Colour }
}

function Invoke-Step {
    param(
        [int]$Number, [string]$Do, [string]$Why,
        [scriptblock]$Command, [switch]$Manual, [string]$Shell = "powershell"
    )
    Write-Rule "  Step $Number of 6"
    Show-Prose $Do "White"
    if ($Why) { Write-Host ""; Show-Prose $Why "DarkGray" }

    if ($Manual) {
        Write-Host ''
        Write-Host '  -> Do this yourself, then press Enter to carry on.' -ForegroundColor Yellow
        if (-not $Unattended -and -not $DryRun) { [void](Read-Host) }
        return
    }

    Write-Host ''
    foreach ($l in ($Command.ToString().Trim() -split "`n")) {
        Write-Host ("    " + $l.Trim()) -ForegroundColor Green
    }
    Write-Host ''

    if ($DryRun) { Write-Host "  (dry run -- not executed)" -ForegroundColor DarkGray; return }
    if (-not $Unattended) {
        $a = Read-Host "  Run this step? [Y]es / [S]kip / [Q]uit"
        if ($a -match "^[Qq]") { Write-Host "  Stopped at your request."; exit 0 }
        if ($a -match "^[Ss]") { Write-Host "  Skipped." -ForegroundColor DarkGray; return }
    }
    try { & $Command }
    catch {
        $script:Failed++
        Write-Host ("  Step $Number failed: " + $_.Exception.Message) -ForegroundColor Red
        Show-Prose "The rest of the fix may depend on this. Read the write-up before carrying on." "Red"
        if (-not $Unattended) {
            $c = Read-Host "  Carry on anyway? [y/N]"
            if ($c -notmatch "^[Yy]") { exit 1 }
        }
    }
}

Write-Rule
Write-Host '  STOP 0x00000050 -- PAGE_FAULT_IN_NONPAGED_AREA' -ForegroundColor White
Write-Host '  Catch the driver with Driver Verifier' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: high   Reversible   1-2 days of normal use'
Write-Host ''
Show-Prose 'No warranty. Use at your own risk - JbTecWiz accepts no liability. Read it before you run it, and have a backup.' 'DarkYellow'
Write-Rule

if (-not $Unattended -and -not $DryRun) {
    $go = Read-Host '  Ready? [y/N]'
    if ($go -notmatch "^[Yy]") { Write-Host "  Nothing was changed."; exit 0 }
}

Invoke-Step -Number 1 -Do 'Make sure you can get into Safe Mode, and know how to reach WinRE. You will very likely need it.' -Why 'Verifier crashes the machine on purpose the moment it catches a driver misbehaving, which can happen during boot.' -Manual

Invoke-Step -Number 2 -Do 'Enable a standard rule set against non-Microsoft drivers only.' -Command {
    cmd.exe /c 'verifier /standard /driver.exclude ntoskrnl.exe'
}

Invoke-Step -Number 3 -Do 'Alternatively use the GUI and select "Automatically select unsigned drivers" for a narrower net.' -Command {
    cmd.exe /c 'verifier'
}

Invoke-Step -Number 4 -Do 'Restart and use the machine normally until it bugchecks.' -Manual

Invoke-Step -Number 5 -Do 'Analyse the dump -- with Verifier active the driver named is reliable.' -Command {
    cmd.exe /c '!analyze -v'
}

Invoke-Step -Number 6 -Do 'Turn Verifier off as soon as you have your answer.' -Command {
    cmd.exe /c 'verifier /reset'
}

Write-Rule "  Confirm it worked"
Show-Prose 'A specific driver is named in the dump and updating or removing it stops the crashes.' 'White'

Write-Rule
if ($script:Failed -gt 0) {
    Write-Host ("  Finished with " + $script:Failed + " failed step(s).") -ForegroundColor Yellow
    Show-Prose 'Read the full write-up at https://jbtecwiz.com/support/win-stop-0x50' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Boot into Safe Mode and run verifier /reset. If Safe Mode will not start either, use WinRE -> Command Prompt and run verifier /reset from there, or use System Restore.' 'DarkGray'
Write-Rule