diff --git a/docs/contrib/scheduler.md b/docs/contrib/scheduler.md
index 1e8d8e2..bc8ee4c 100644
--- a/docs/contrib/scheduler.md
+++ b/docs/contrib/scheduler.md
@@ -60,3 +60,9 @@ python command.py scheduler run d41d8cd98f00b204e9800998ecf8427e  # run by OS-sc
 - `PERIODIC_JOBS_USERNAME` (str, Windows only) - by default `"System"`
 - `PERIODIC_JOBS_PASSWORD` (str, Windows only) - by default `None`
 - `PERIODIC_JOBS_BACKEND` (str) - path to override default backend class - by default `None`
+
+#### Note about console popup on Windows
+
+If Windows scheduler task with default Python executable shows up console popup on each run, 
+you may want to substitute `python.exe` with `pythonw.exe` in `PERIODIC_JOBS_PYTHON_EXECUTABLE`. 
+Note, that it has its own [caveats](https://stackoverflow.com/a/30313091).
diff --git a/starlette_web/contrib/scheduler/backends/win32.py b/starlette_web/contrib/scheduler/backends/win32.py
index f04365c..b977857 100644
--- a/starlette_web/contrib/scheduler/backends/win32.py
+++ b/starlette_web/contrib/scheduler/backends/win32.py
@@ -109,7 +109,7 @@ def update_jobs(self):
                 execution_time_limit=False,
                 force_stop=True,
                 delete_after=False,
-                multiple_instances=not self.settings.LOCK_JOBS,
+                multiple_instances=["Parallel", "No New Instance"][self.settings.LOCK_JOBS],
                 action_type="Execute",
                 cmd=self.settings.PYTHON_EXECUTABLE,
                 arguments=(