diff --git a/main.js b/main.js
index db9ce14..45e6118 100644
--- a/main.js
+++ b/main.js
@@ -41,26 +41,31 @@ function windows(brightness,callback){
 
 	// powercfg -q gives information about power settings, but can only give accurate brightness info for laptops or other portable windows devices
 
-	exec('powercfg -q', function(error,stdout,stderr){
-		if(!error){
-			var regExp =  /([a-z\-0-9]+)\s\D+$/
-			var splitOutput = stdout.split('\r\n');
-			GUID = regExp.exec(splitOutput[0])[1];
+    // Get the current power scheme GUID
+    exec("powercfg /getactivescheme", function (error, stdout, stderr) {
+        if (error) throw error;
 
-			for(var i = 0;i<splitOutput.length;i++){
-				if(splitOutput[i].match(/\(Display\)$/)){
+        const match = stdout.match(/GUID:\s*([a-f0-9\-]+)/i);
+        if (!match) throw new Error("Failed to retrieve the power scheme GUID");
+        GUID = match[1];
 
-					//The subgroup is derived from the output named display
+        // Get the SUB_VIDEO subgroup GUID
+        exec("powercfg -aliases | findstr /i SUB_VIDEO", function (error, stdout, stderr) {
+            if (error) throw error;
 
-					subgroup = regExp.exec(splitOutput[i])[1];
-				}
-				else if(splitOutput[i].match(/\(Display\sbrightness\)$/)){
+            const matchSub = stdout.match(/([a-f0-9\-]+)\s+SUB_VIDEO/i);
+            if (!matchSub) throw new Error("Failed to retrieve the SUB_VIDEO GUID");
+            subgroup = matchSub[1];
 
-					//The powerSetting is derived from the output named Display
+            // Get the GUID of VIDEONORMALLEVEL
+            exec("powercfg -aliases | findstr /i VIDEONORMALLEVEL", function (error, stdout, stderr) {
+                if (error) throw error;
 
-					powerSetting = regExp.exec(splitOutput[i])[1];
-				}
-			}
+                const matchPower = stdout.match(
+                  /([a-f0-9\-]+)\s+VIDEONORMALLEVEL/i
+                );
+                if (!matchPower) throw new Error("Failed to retrieve the VIDEONORMALLEVEL GUID");
+                powerSetting = matchPower[1];
 
 			//console.log(GUID,subgroup,powerSetting);
 
@@ -84,11 +89,9 @@ function windows(brightness,callback){
 				});
 			});
 
-		}
-		else{
-			throw error;
-		}
-	});
+            });
+        });
+    });
 }
 
 function changeBrightness(brightness,callback){