diff --git a/build_windows.ps1 b/build_windows.ps1
index c4789ab..1783d5b 100644
--- a/build_windows.ps1
+++ b/build_windows.ps1
@@ -5,6 +5,13 @@
 $ErrorActionPreference = "Stop"
 Set-Location $PSScriptRoot
 
+# Kill moi daw_engine con song tu build/truoc (windowed, khong console ->
+# de quen -> file exe dang chay bi khoa -> Tauri build loi PermissionDenied
+# khi doc externalBin). Stop-Process im lang neu khong co tien trinh nao.
+Write-Host "== [0/6] Kill daw_engine.exe cu (neu dang chay) =="
+Get-Process -Name "daw_engine" -ErrorAction SilentlyContinue | Stop-Process -Force -ErrorAction SilentlyContinue
+Start-Sleep -Milliseconds 500
+
 Write-Host "== [1/6] Python dependencies =="
 python -m pip install --upgrade pip
 python -m pip install -r requirements.txt pyinstaller pywin32