diff --git a/tools/internal_ci/helper_scripts/prepare_build_windows.bat b/tools/internal_ci/helper_scripts/prepare_build_windows.bat
index 58ed4ef5136..aacae5c5213 100644
--- a/tools/internal_ci/helper_scripts/prepare_build_windows.bat
+++ b/tools/internal_ci/helper_scripts/prepare_build_windows.bat
@@ -13,12 +13,12 @@
 @rem limitations under the License.
 
 @rem make sure msys binaries are preferred over cygwin binaries
-@rem set path to python3.7
+@rem set path to python 2.7
 @rem set path to CMake
-set PATH=C:\tools\msys64\usr\bin;C:\Python37;C:\Program Files\CMake\bin;%PATH%
+set PATH=C:\tools\msys64\usr\bin;C:\Python37;C:\Python27;C:\Program Files\CMake\bin;%PATH%
 
-@rem create "python3" link that normally doesn't exist
 dir C:\Python37\
+
 mklink C:\Python37\python3.exe C:\Python37\python.exe
 
 python --version
@@ -36,19 +36,12 @@ netsh interface ip set dns "Local Area Connection 8" static 169.254.169.254 prim
 netsh interface ip add dnsservers "Local Area Connection 8" 8.8.8.8 index=2
 netsh interface ip add dnsservers "Local Area Connection 8" 8.8.4.4 index=3
 
-@rem Only install C# dependencies if we are running C# tests
-If "%PREPARE_BUILD_INSTALL_DEPS_CSHARP%" == "true" (
-  @rem C# prerequisites: Install dotnet SDK
-  powershell -File src\csharp\install_dotnet_sdk.ps1 || goto :error
-)
 
-@rem Add dotnet on path and disable some unwanted dotnet
-@rem option regardless of PREPARE_BUILD_INSTALL_DEPS_CSHARP value.
-@rem Always setting the env vars is fine since its instantaneous,
-@rem it can't fail and it avoids possible issues with
-@rem "setlocal" and "EnableDelayedExpansion" which would be required if
-@rem we wanted to do the same under the IF block.
+@rem C# prerequisites: Install dotnet SDK
+powershell -File src\csharp\install_dotnet_sdk.ps1 || goto :error
 set PATH=%LOCALAPPDATA%\Microsoft\dotnet;%PATH%
+
+@rem Disable some unwanted dotnet options
 set NUGET_XMLDOC_MODE=skip
 set DOTNET_SKIP_FIRST_TIME_EXPERIENCE=true
 set DOTNET_CLI_TELEMETRY_OPTOUT=true
@@ -58,7 +51,7 @@ If "%PREPARE_BUILD_INSTALL_DEPS_PYTHON%" == "true" (
     powershell -File tools\internal_ci\helper_scripts\install_python_interpreters.ps1 || goto :error
 )
 
-@rem Needed for uploading test results to bigquery
+@rem Needed for big_query_utils
 python -m pip install google-api-python-client || goto :error
 
 git submodule update --init || goto :error
diff --git a/tools/internal_ci/windows/bazel_rbe.bat b/tools/internal_ci/windows/bazel_rbe.bat
index 5a02d856e24..7721bdec8ff 100644
--- a/tools/internal_ci/windows/bazel_rbe.bat
+++ b/tools/internal_ci/windows/bazel_rbe.bat
@@ -22,13 +22,16 @@ IF "%cd%"=="T:\src" (
 )
 endlocal
 
+@rem TODO(jtattermusch): make this generate less output
+@rem TODO(jtattermusch): use tools/bazel script to keep the versions in sync
+choco install bazel -y --version 4.2.1 --limit-output
+
 cd github/grpc
+set PATH=C:\tools\msys64\usr\bin;C:\Python37;%PATH%
 
-call tools/internal_ci/helper_scripts/prepare_build_windows.bat || exit /b 1
+python --version
 
-@rem TODO(jtattermusch): make this generate less output
-@rem TODO(jtattermusch): use tools/bazel script to keep the versions in sync
-choco install bazel -y --version 4.2.1 --limit-output || exit /b 1
+python -m pip install --user google-api-python-client oauth2client six==1.16.0
 
 @rem Generate a random UUID and store in "bazel_invocation_ids" artifact file
 powershell -Command "[guid]::NewGuid().ToString()" >%KOKORO_ARTIFACTS_DIR%/bazel_invocation_ids
@@ -41,7 +44,7 @@ set BAZEL_EXITCODE=%errorlevel%
 if not "%UPLOAD_TEST_RESULTS%"=="" (
   @rem Sleep to let ResultStore finish writing results before querying
   sleep 60
-  python3 tools/run_tests/python_utils/upload_rbe_results.py || exit /b 1
+  python ./tools/run_tests/python_utils/upload_rbe_results.py
 )
 
 exit /b %BAZEL_EXITCODE%
diff --git a/tools/internal_ci/windows/grpc_build_artifacts.bat b/tools/internal_ci/windows/grpc_build_artifacts.bat
index 286ed330938..f509238e587 100644
--- a/tools/internal_ci/windows/grpc_build_artifacts.bat
+++ b/tools/internal_ci/windows/grpc_build_artifacts.bat
@@ -24,12 +24,11 @@ endlocal
 
 @rem Boringssl build no longer supports yasm
 choco uninstall yasm -y --limit-output
-choco install nasm -y --limit-output || exit /b 1
+choco install nasm -y --limit-output
 
 @rem enter repo root
 cd /d %~dp0\..\..\..
 
-set PREPARE_BUILD_INSTALL_DEPS_CSHARP=true
 set PREPARE_BUILD_INSTALL_DEPS_PYTHON=true
 call tools/internal_ci/helper_scripts/prepare_build_windows.bat || exit /b 1
 
diff --git a/tools/internal_ci/windows/grpc_build_packages.bat b/tools/internal_ci/windows/grpc_build_packages.bat
new file mode 100644
index 00000000000..8f68f181880
--- /dev/null
+++ b/tools/internal_ci/windows/grpc_build_packages.bat
@@ -0,0 +1,37 @@
+@rem Copyright 2017 gRPC authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem     http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+
+@rem Avoid slow finalization after the script has exited.
+@rem See the script's prologue for info on the correct invocation pattern.
+setlocal EnableDelayedExpansion
+IF "%cd%"=="T:\src" (
+  call %~dp0\..\..\..\tools\internal_ci\helper_scripts\move_src_tree_and_respawn_itself.bat %0
+  echo respawn script has finished with exitcode !errorlevel!
+  exit /b !errorlevel!
+)
+endlocal
+
+@rem enter repo root
+cd /d %~dp0\..\..\..
+
+call tools/internal_ci/helper_scripts/prepare_build_windows.bat || exit /b 1
+
+rem NOTHING TO DO HERE
+rem This script used to run "task_runner.py -f package windows", but
+rem currently there are no build_packages tasks that need to be run on windows.
+rem The only build_packages task that ever needed to run on windows was C#, but we switched to
+rem building C# nugets on linux (as dotnet SDK on linux does a good job)
+rem TODO(jtattermusch): remove the infrastructure for running "build_packages" kokoro job on windows.
+
+exit /b %RUNTESTS_EXITCODE%
diff --git a/tools/internal_ci/windows/grpc_build_packages.cfg b/tools/internal_ci/windows/grpc_build_packages.cfg
new file mode 100644
index 00000000000..b351bbb11b3
--- /dev/null
+++ b/tools/internal_ci/windows/grpc_build_packages.cfg
@@ -0,0 +1,26 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/windows/grpc_build_packages.bat"
+timeout_mins: 120
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.*"
+    regex: "github/grpc/reports/**"
+    regex: "github/grpc/artifacts/**"
+  }
+}
diff --git a/tools/internal_ci/windows/grpc_distribtests.bat b/tools/internal_ci/windows/grpc_distribtests.bat
index a890ef54810..e426e75225c 100644
--- a/tools/internal_ci/windows/grpc_distribtests.bat
+++ b/tools/internal_ci/windows/grpc_distribtests.bat
@@ -25,7 +25,6 @@ endlocal
 @rem enter repo root
 cd /d %~dp0\..\..\..
 
-set PREPARE_BUILD_INSTALL_DEPS_CSHARP=true
 call tools/internal_ci/helper_scripts/prepare_build_windows.bat || exit /b 1
 
 @rem Move packages generated by the previous step in the build chain.
diff --git a/tools/internal_ci/windows/grpc_run_tests_matrix.bat b/tools/internal_ci/windows/grpc_run_tests_matrix.bat
index 209a6b8b90e..34895e9d764 100644
--- a/tools/internal_ci/windows/grpc_run_tests_matrix.bat
+++ b/tools/internal_ci/windows/grpc_run_tests_matrix.bat
@@ -25,11 +25,6 @@ endlocal
 @rem enter repo root
 cd /d %~dp0\..\..\..
 
-@rem if RUN_TESTS_FLAGS contains the string "csharp", make sure C# deps are installed.
-If Not "%RUN_TESTS_FLAGS%"=="%RUN_TESTS_FLAGS:csharp=%" (
-    set PREPARE_BUILD_INSTALL_DEPS_CSHARP=true
-)
-@rem if RUN_TESTS_FLAGS contains the string "python", make sure python deps are installed.
 If Not "%RUN_TESTS_FLAGS%"=="%RUN_TESTS_FLAGS:python=%" (
     set PREPARE_BUILD_INSTALL_DEPS_PYTHON=true
 )
@@ -38,7 +33,7 @@ call tools/internal_ci/helper_scripts/prepare_build_windows.bat || exit /b 1
 @rem TODO(https://github.com/grpc/grpc/issues/28011): Remove once Windows Kokoro workers'
 @rem   Python installs have been upgraded. Currently, removing this line will cause
 @rem   run_tests.py to fail to spawn test subprocesses.
-python3 tools/run_tests/start_port_server.py || exit /b 1
+python3 tools/run_tests/start_port_server.py
 
 python3 tools/run_tests/run_tests_matrix.py %RUN_TESTS_FLAGS%
 set RUNTESTS_EXITCODE=%errorlevel%