diff --git a/install_newt-msp-site_v2.sh b/install_newt-msp-site_v2.sh
index 68dfcd1..882ca34 100644
--- a/install_newt-msp-site_v2.sh
+++ b/install_newt-msp-site_v2.sh
@@ -1,211 +1,180 @@
-#!/bin/bash
-set -e
+<#
+.SYNOPSIS
+    Windows-Installer für den Newt-Client.
+    Finaler Fix für Taskplaner Error 0x1 & Pfad-Probleme.
+#>
+param([string]$mode = "install")
 
-REPO="fosrl/newt"
-INSTALL_DIR="/opt/me-msp-newt"
-SERVICE_NAME="MAIEREDV-Managed-Site-Client"
-SYMLINK="${INSTALL_DIR}/newt_latest"
-SERVICE_FILE="/etc/systemd/system/${SERVICE_NAME}.service"
-UPDATER_SERVICE="/etc/systemd/system/newt-updater.service"
-UPDATER_TIMER="/etc/systemd/system/newt-updater.timer"
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+[Console]::OutputEncoding = [System.Text.Encoding]::UTF8
 
-GREEN='\033[0;32m'
-YELLOW='\033[1;33m'
-RED='\033[0;31m'
-NC='\033[0m'
+# --- Konfiguration ---
+$Repo = "fosrl/newt"
+$InstallDir = "C:\Program Files\me-msp-newt"
+$ServiceName = "MAIEREDV-Managed-Site-Client"
+$Symlink = "$InstallDir\newt_latest.exe"
+$UpdaterTaskName = "MAIEREDV-Newt-Updater"
+$GiteaUrl = "https://me-gitea.maieredv.cloud/manuel.maier/update-install-newt/raw/branch/main/install_newt-msp-site-win_v2.ps1"
 
-info()  { echo -e "${GREEN}[INFO]${NC} $1"; }
-warn()  { echo -e "${YELLOW}[WARN]${NC} $1"; }
-error() { echo -e "${RED}[ERROR]${NC} $1"; exit 1; }
-
-get_latest_version() {
-  curl -fsSL "https://api.github.com/repos/${REPO}/releases/latest" | grep -Po '"tag_name": *"\K[^"]+'
+function Write-Log($msg, $color = "White") { 
+    Write-Host "[$(Get-Date -Format 'HH:mm:ss')] $msg" -ForegroundColor $color 
 }
 
-download_newt() {
-  local version="$1"
-  local arch=$(uname -m)
-  local file=""
+# --- Umgebung vorbereiten ---
+function Prepare-Environment {
+    if (!(Get-Command winget -ErrorAction SilentlyContinue)) {
+        Write-Log "Winget fehlt. Installiere via winget.pro..." "Cyan"
+        try {
+            Invoke-RestMethod -Uri "https://winget.pro/install.ps1" | Invoke-Expression
+            $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
+        } catch {
+            Write-Log "FEHLER: Winget Installation fehlgeschlagen." "Red"; exit 1
+        }
+    }
 
-  case "$arch" in
-    x86_64) file="newt_linux_amd64" ;;
-    aarch64) file="newt_linux_arm64" ;;
-    armv7l) file="newt_linux_arm32" ;;
-    *) error "Unsupported architecture: $arch" ;;
-  esac
-
-  local url="https://github.com/${REPO}/releases/download/${version}/${file}"
-  local target="${INSTALL_DIR}/newt_${version}"
-  mkdir -p "$INSTALL_DIR"
-
-  info "⬇️ Downloading $url …"
-  curl -fsSL "$url" -o "${target}.tmp" || error "Download failed."
-  chmod +x "${target}.tmp"
-  mv "${target}.tmp" "$target"
-  ln -sf "$target" "$SYMLINK"
-  info "✅ Installed newt ${version} at ${target}"
+    if (!(Get-Command nssm -ErrorAction SilentlyContinue)) {
+        Write-Log "NSSM wird via Winget bereitgestellt..." "Cyan"
+        winget install nssm --silent --accept-package-agreements --accept-source-agreements | Out-Null
+        $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
+    }
 }
 
-setup_systemd_service() {
-  echo "🆔 Please enter the Pangolin ID: "
-  read -r PANGOLIN_ID
-  echo "🔑 Please enter the Secret: "
-  read -r PANGOLIN_SECRET
-  echo "🌐 Please enter the Endpoint (e.g. https://pangolin.domain.com): "
-  read -r PANGOLIN_ENDPOINT
-
-  cat > "$SERVICE_FILE" <<EOF
-[Unit]
-Description=Newt Client - ${SERVICE_NAME}
-After=network.target
-
-[Service]
-ExecStart=${SYMLINK} --id ${PANGOLIN_ID} --secret ${PANGOLIN_SECRET} --endpoint ${PANGOLIN_ENDPOINT}
-Restart=always
-RestartSec=5
-
-[Install]
-WantedBy=multi-user.target
-EOF
-
-  systemctl daemon-reload
-  systemctl enable "$SERVICE_NAME"
-  systemctl restart "$SERVICE_NAME"
-  info "🛠️ Systemd service ${SERVICE_NAME} has been set up and started."
+function Get-LatestVersion {
+    try {
+        $url = "https://api.github.com/repos/${Repo}/releases/latest"
+        $json = Invoke-RestMethod -Uri $url -UseBasicParsing
+        return $json.tag_name
+    } catch {
+        Write-Log "FEHLER: GitHub API nicht erreichbar." "Red"; exit 1
+    }
 }
 
-setup_update_timer() {
-  if [[ -f "$UPDATER_SERVICE" && -f "$UPDATER_TIMER" ]]; then
-    info "⏳ Update timer already exists – skipping."
-    return
-  fi
+# --- Download & Cleanup ---
+function Download-Newt {
+    param($FullVersion)
+    $ArchSuffix = if ([Environment]::Is64BitOperatingSystem) { "windows_amd64.exe" } else { "windows_386.exe" }
+    $VersionOnly = $FullVersion.TrimStart('v')
+    $Url = "https://github.com/${Repo}/releases/download/${VersionOnly}/newt_${ArchSuffix}"
+    $Target = "${InstallDir}\newt_${VersionOnly}.exe"
 
-  info "⚙️ Creating systemd timer for daily updates …"
+    if (!(Test-Path $InstallDir)) { New-Item -ItemType Directory -Path $InstallDir -Force | Out-Null }
+    
+    if (!(Test-Path $Target)) {
+        Write-Log "Downloade Version $VersionOnly..." "Cyan"
+        try {
+            Start-BitsTransfer -Source $Url -Destination $Target -Priority Foreground -ErrorAction Stop
+        } catch {
+            Write-Log "BITS fehlgeschlagen. Versuche Web-Fallback..." "Yellow"
+            Invoke-WebRequest -Uri $Url -OutFile $Target -UseBasicParsing
+        }
+    }
 
-  cat > "$UPDATER_SERVICE" <<EOF
-[Unit]
-Description=Automatic update for Newt installer
+    $Service = Get-Service $ServiceName -ErrorAction SilentlyContinue
+    $WasRunning = $Service -and $Service.Status -eq 'Running'
 
-[Service]
-Type=oneshot
-ExecStart=/bin/bash -c 'curl -fsSL https://gitea.vmd55888.de/manuel.maier/update-install-newt/raw/branch/main/install_newt-msp-site_v2.sh | bash -s -- --update'
-EOF
+    if ($WasRunning) {
+        Write-Log "Stoppe Dienst für Datei-Update..." "Yellow"
+        Stop-Service $ServiceName -Force
+    }
 
-  cat > "$UPDATER_TIMER" <<EOF
-[Unit]
-Description=Run newt-updater.service daily
+    try {
+        Copy-Item -Path $Target -Destination $Symlink -Force
+        Write-Log "newt_latest.exe auf Stand $VersionOnly aktualisiert." "Green"
+    } catch {
+        Write-Log "FEHLER: Datei blockiert." "Red"
+    }
 
-[Timer]
-OnCalendar=03:00
-Persistent=true
+    if ($WasRunning) {
+        Start-Service $ServiceName
+        Write-Log "Dienst wieder gestartet." "Green"
+    }
 
-[Install]
-WantedBy=timers.target
-EOF
+    # Cleanup: Behalte die neuesten 2 Versionen
+    $OldVersions = Get-ChildItem -Path $InstallDir -Filter "newt_*.exe" | 
+                   Where-Object { $_.Name -ne "newt_latest.exe" } | 
+                   Sort-Object LastWriteTime -Descending | 
+                   Select-Object -Skip 2
 
-  systemctl daemon-reload
-  systemctl enable --now newt-updater.timer
-  info "✅ Update timer created (runs daily at 03:00)."
+    foreach ($file in $OldVersions) {
+        Remove-Item $file.FullName -Force
+    }
 }
 
-mode_install() {
-  local version
-  version=$(get_latest_version)
-  version=${version#v}
-  info "📦 Latest version: $version"
+function Setup-Service {
+    if (!(Get-Service $ServiceName -ErrorAction SilentlyContinue)) {
+        Write-Log "--- Dienst-Konfiguration ---" "Yellow"
+        $PangolinID = Read-Host "Bitte Pangolin ID eingeben"
+        $PangolinSecret = Read-Host "Bitte Secret eingeben"
+        $PangolinEndpoint = Read-Host "Bitte Endpoint eingeben"
 
-  if [ -f "${INSTALL_DIR}/newt_${version}" ]; then
-    warn "⚠️ Version $version is already installed. Skipping installation."
-    warn "👉 Use '--reinstall' if you want to force a reinstall."
-    setup_update_timer
-    exit 0
-  fi
-
-  download_newt "$version"
-  setup_systemd_service
-  setup_update_timer
-  info "🚀 Installation completed!"
+        $ArgList = "--id ${PangolinID} --secret ${PangolinSecret} --endpoint ${PangolinEndpoint}"
+        
+        & nssm install $ServiceName "$Symlink" $ArgList
+        & nssm set $ServiceName Description "MAIEREDV Managed Site Client"
+        & nssm set $ServiceName AppExit Default Restart
+        & nssm set $ServiceName AppRestartDelay 5000
+        
+        $LogFile = "${InstallDir}\newt_service.log"
+        & nssm set $ServiceName AppStdout "$LogFile"
+        & nssm set $ServiceName AppStderr "$LogFile"
+        & nssm set $ServiceName AppRotateFiles 1
+        & nssm set $ServiceName AppRotateOnline 1
+        & nssm set $ServiceName AppRotateBytes 10485760
+        
+        Start-Service $ServiceName
+    }
 }
 
-mode_update() {
-  local version
-  version=$(get_latest_version)
-  version=${version#v}
-  info "📦 Latest version: $version"
+function Setup-UpdaterTask {
+    # Wir bauen den Befehl so um, dass er robuster gegenüber Gänsefüßchen ist
+    $ScriptBody = "[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; `$s = (New-Object System.Net.WebClient).DownloadString('$GiteaUrl'); `$b = [scriptblock]::Create(`$s); & `$b -mode update"
+    $ActionCommand = "powershell.exe -NoProfile -ExecutionPolicy Bypass -Command `"$ScriptBody`""
+    
+    $Action = New-ScheduledTaskAction -Execute "powershell.exe" -Argument "-NoProfile -ExecutionPolicy Bypass -Command `"$ScriptBody`""
+    $Trigger = New-ScheduledTaskTrigger -Daily -At 3am
+    $Principal = New-ScheduledTaskPrincipal -UserId "SYSTEM" -LogonType ServiceAccount -RunLevel Highest
 
-  if [ -f "${INSTALL_DIR}/newt_${version}" ]; then
-    info "✅ Version $version is already installed. No update required."
-    setup_update_timer
-    exit 0
-  fi
-
-  download_newt "$version"
-  systemctl restart "$SERVICE_NAME"
-  setup_update_timer
-  info "🚀 Update completed!"
+    # Task registrieren
+    Register-ScheduledTask -Action $Action -Trigger $Trigger -Principal $Principal -TaskName $UpdaterTaskName -Force | Out-Null
+    Write-Log "Update-Task (03:00 Uhr) mit SYSTEM-Principal registriert." "Green"
 }
 
-mode_reinstall() {
-  local version
-  version=$(get_latest_version)
-  version=${version#v}
-  info "📦 Latest version: $version"
+# --- Main ---
+Prepare-Environment
 
-  download_newt "$version"
-  setup_systemd_service
-  setup_update_timer
-  info "🚀 Reinstallation completed!"
-}
+switch ($mode) {
+    "install" {
+        $v = Get-LatestVersion
+        Download-Newt $v
+        Setup-Service
+        Setup-UpdaterTask
+        Write-Log "🚀 Installation abgeschlossen!" "Green"
+    }
+    "update" {
+        $v = Get-LatestVersion
+        $vOnly = $v.TrimStart('v')
+        $TargetVersionPath = "${InstallDir}\newt_${vOnly}.exe"
 
-mode_uninstall() {
-  warn "⚠️ Uninstalling newt and removing all systemd entries …"
+        $NeedsUpdate = $false
+        if (!(Test-Path $TargetVersionPath)) {
+            $NeedsUpdate = $true
+        } elseif (Test-Path $Symlink) {
+            $HashLatest = (Get-FileHash $Symlink).Hash
+            $HashTarget = (Get-FileHash $TargetVersionPath).Hash
+            if ($HashLatest -ne $HashTarget) { $NeedsUpdate = $true }
+        } else { $NeedsUpdate = $true }
 
-  # Stop and remove service
-  if systemctl is-active --quiet "$SERVICE_NAME"; then
-    systemctl stop "$SERVICE_NAME"
-  fi
-  systemctl disable "$SERVICE_NAME" 2>/dev/null || true
-  rm -f "$SERVICE_FILE"
-
-  # Remove updater
-  if systemctl is-active --quiet newt-updater.timer; then
-    systemctl stop newt-updater.timer
-  fi
-  systemctl disable newt-updater.timer 2>/dev/null || true
-  rm -f "$UPDATER_SERVICE" "$UPDATER_TIMER"
-
-  systemctl daemon-reload
-
-  # Delete installation dir (ask first)
-  if [ -d "$INSTALL_DIR" ]; then
-    read -p "❓ Do you want to remove ${INSTALL_DIR} and all versions? (y/N): " yn
-    case $yn in
-      [Yy]*) rm -rf "$INSTALL_DIR"; info "📂 ${INSTALL_DIR} was removed." ;;
-      *) warn "📂 ${INSTALL_DIR} was NOT removed." ;;
-    esac
-  fi
-
-  info "🧹 Uninstallation completed!"
-}
-
-main() {
-  case "$1" in
-    --install|"")
-      mode_install
-      ;;
-    --update)
-      mode_update
-      ;;
-    --reinstall)
-      mode_reinstall
-      ;;
-    --uninstall)
-      mode_uninstall
-      ;;
-    *)
-      error "❌ Unknown parameter: $1 (use --install, --update, --reinstall or --uninstall)"
-      ;;
-  esac
-}
-
-main "$@"
+        if ($NeedsUpdate) {
+            Download-Newt $v
+        } else {
+            if ((Get-Service $ServiceName).Status -ne 'Running') { Start-Service $ServiceName }
+        }
+    }
+    "uninstall" {
+        if (Get-Service $ServiceName -ErrorAction SilentlyContinue) {
+            Stop-Service $ServiceName -Force
+            & nssm remove $ServiceName confirm
+        }
+        Unregister-ScheduledTask -TaskName $UpdaterTaskName -Confirm:$false -ErrorAction SilentlyContinue
+    }
+}
\ No newline at end of file