diff --git a/custom_components/easy_computer_manager/computer/__init__.py b/custom_components/easy_computer_manager/computer/__init__.py
index b6d4c59..1913a5a 100644
--- a/custom_components/easy_computer_manager/computer/__init__.py
+++ b/custom_components/easy_computer_manager/computer/__init__.py
@@ -171,13 +171,12 @@ class Computer:
 
     async def install_nircmd(self) -> None:
         """Install NirCmd tool (Windows specific)."""
-        # Implementation needed
-        pass
+        await self.run_action("install_nircmd", params={"download_url": "https://www.nirsoft.net/utils/nircmd.zip",
+                                                        "install_path": f"C:\\Users\\{self.username}\\AppData\\Local\\EasyComputerManager"})
 
     async def steam_big_picture(self, action: str) -> None:
         """Start, stop or exit Steam Big Picture mode."""
-        # Implementation needed
-        pass
+        await self.run_action(f"{action}_steam_big_picture")
 
     async def run_action(self, id: str, params=None, raise_on_error: bool = None) -> CommandOutput:
         """Run a predefined command via SSH."""
diff --git a/custom_components/easy_computer_manager/const.py b/custom_components/easy_computer_manager/const.py
index 929c4b2..c74a868 100644
--- a/custom_components/easy_computer_manager/const.py
+++ b/custom_components/easy_computer_manager/const.py
@@ -75,5 +75,23 @@ ACTIONS = {
             "command": "bluetoothctl info",
             "raise_on_error": False,
         }
-    }
+    },
+    "install_nirmcd": {
+        "windows": {
+            "command": "powershell -Command \"Invoke-WebRequest -Uri %download_url% -OutFile %install_path%\\nircmd.zip -UseBasicParsing; Expand-Archive %install_path%\\nircmd.zip -DestinationPath %install_path%; Remove-Item %install_path%\\nircmd.zip\"",
+            "params": ["download_url", "install_path"]
+        }
+    },
+    "start_steam_big_picture": {
+        "linux": "export WAYLAND_DISPLAY=wayland-0; export DISPLAY=:0; steam -bigpicture &",
+        "windows": "start steam://open/bigpicture"
+    },
+    "stop_steam_big_picture": {
+        "linux": "export WAYLAND_DISPLAY=wayland-0; export DISPLAY=:0; steam -shutdown &",
+        "windows": "C:\\Program Files (x86)\\Steam\\steam.exe -shutdown"
+    },
+    "exit_steam_big_picture": {
+        "linux": "",  # TODO: find a way to exit steam big picture
+        "windows": "nircmd win close title \"Steam Big Picture Mode\""
+    },
 }
\ No newline at end of file