diff --git a/src/nxDumpFuse/Services/FuseService.cs b/src/nxDumpFuse/Services/FuseService.cs
index 9254f26..095100a 100644
--- a/src/nxDumpFuse/Services/FuseService.cs
+++ b/src/nxDumpFuse/Services/FuseService.cs
@@ -15,10 +15,7 @@ namespace nxDumpFuse.Services
     {
         
         private CancellationTokenSource? _cts;
-        private string? _inputFilePath;
-        private string? _outputDir;
         private string? _outputFilePath;
-        private FileCase _fileCase;
         private readonly Stopwatch _sw = new();
 
         public event EventHandlers.FuseUpdateEventHandler? FuseUpdateEvent;
@@ -54,29 +51,28 @@ namespace nxDumpFuse.Services
 
         public void Start(string inputFilePath, string outputDir)
         {
-            _inputFilePath = inputFilePath;
-            _outputDir = outputDir;
             _cts = new CancellationTokenSource();
 
-            if (string.IsNullOrEmpty(_inputFilePath))
+            if (string.IsNullOrEmpty(inputFilePath))
             {
                 Log(FuseSimpleLogType.Error, "Input File cannot be empty");
                 return;
             }
-            if (string.IsNullOrEmpty(_outputDir))
+            if (string.IsNullOrEmpty(outputDir))
             {
                 Log(FuseSimpleLogType.Error, "Output Directory cannot be empty");
                 return;
             }
-            
-            (_outputFilePath, _fileCase) = _inputFilePath.GetOutputFilePath(_outputDir);
-            if (string.IsNullOrEmpty(_outputFilePath) || _fileCase == FileCase.Invalid)
+
+            FileCase fileCase;
+            (_outputFilePath, fileCase) = inputFilePath.GetOutputFilePath(outputDir);
+            if (string.IsNullOrEmpty(_outputFilePath) || fileCase == FileCase.Invalid)
             {
                 Log(FuseSimpleLogType.Error, "Output path was null");
                 return;
             }
 
-            var inputFiles = _inputFilePath.GetInputFiles(_fileCase);
+            var inputFiles = inputFilePath.GetInputFiles(fileCase);
             if (inputFiles.Count == 0)
             {
                 Log(FuseSimpleLogType.Error, "No input files found");
@@ -88,12 +84,12 @@ namespace nxDumpFuse.Services
 
         public void Stop()
         {
-            _cts.Cancel();
+            _cts?.Cancel();
             _sw.Stop();
 
             Log(FuseSimpleLogType.Information, "Fuse Stopped");
 
-            if (File.Exists(_outputFilePath))
+            if (!string.IsNullOrEmpty(_outputFilePath) && File.Exists(_outputFilePath))
             {
                 Task.Run((() =>
                 {
@@ -126,10 +122,10 @@ namespace nxDumpFuse.Services
             Log(FuseSimpleLogType.Information, $"Fusing {inputFiles.Count} parts to {_outputFilePath}  ({totalFileLength.ToMb()}MB)");
 
             _sw.Start();
-            await using var outputStream = File.Create(_outputFilePath);
+            await using var outputStream = File.Create(_outputFilePath!);
             foreach (var inputFilePath in inputFiles)
             {
-                if (_cts.Token.IsCancellationRequested) return;
+                if (_cts!.Token.IsCancellationRequested) return;
                 long currentBytes = 0;
                 int currentBlockSize;
                 long copySpeed = 0;
diff --git a/src/nxDumpFuse/ViewModels/FuseViewModel.cs b/src/nxDumpFuse/ViewModels/FuseViewModel.cs
index 4349976..5bb38c2 100644
--- a/src/nxDumpFuse/ViewModels/FuseViewModel.cs
+++ b/src/nxDumpFuse/ViewModels/FuseViewModel.cs
@@ -23,12 +23,24 @@ namespace nxDumpFuse.ViewModels
         {
             _dialogService = dialogService;
             _fuseService = fuseServiceService;
+            _fuseService.FuseUpdateEvent += OnFuseServiceUpdate;
+            _fuseService.FuseSimpleLogEvent += OnFuseServiceSimpleLogEvent;
 
             SelectInputFileCommand = ReactiveCommand.Create(SelectInputFile);
             SelectOutputFolderCommand = ReactiveCommand.Create(SelectOutputFolder);
-            FuseCommand = ReactiveCommand.Create(FuseNxDump);
-            StopCommand = ReactiveCommand.Create(StopDump);
             ClearLogCommand = ReactiveCommand.Create(ClearLog);
+
+
+            var canFuse = this.WhenAnyValue(vm => vm.InputFilePath, vm => vm.OutputDir, vm => vm.IsBusy,
+                (input, output, isBusy) => !string.IsNullOrWhiteSpace(input) &&
+                                           !string.IsNullOrWhiteSpace(output) &&
+                                           !isBusy);
+
+            var canStop = this.WhenAnyValue(vm => vm.IsBusy);
+
+            StartCommand = ReactiveCommand.Create(StartFuse, canFuse);
+            StopCommand = ReactiveCommand.Create(StopFuse, canStop);
+
             ProgressPartText = "Part 0/0";
         }
 
@@ -38,10 +50,17 @@ namespace nxDumpFuse.ViewModels
 
         public ReactiveCommand<Unit, Unit> ClearLogCommand { get; }
 
-        public ReactiveCommand<Unit, Unit> FuseCommand { get; }
+        public ReactiveCommand<Unit, Unit> StartCommand { get; }
 
         public ReactiveCommand<Unit, Unit> StopCommand { get; }
 
+        private bool _isBusy;
+        public bool IsBusy
+        {
+            get => _isBusy;
+            set => this.RaiseAndSetIfChanged(ref _isBusy, value);
+        }
+
         private string _inputFilePath = string.Empty;
         public string InputFilePath
         {
@@ -88,39 +107,7 @@ namespace nxDumpFuse.ViewModels
         public ObservableCollection<FuseSimpleLog> LogItems
         {
             get => _logItems;
-            set => this.RaiseAndSetIfChanged( ref _logItems, value);
-        }
-
-        private async void SelectInputFile()
-        {
-            InputFilePath = await _dialogService.ShowOpenFileDialogAsync("Choose Input File", new FileDialogFilter { Name = string.Empty, Extensions = new List<string>() });
-        }
-
-        private async void SelectOutputFolder()
-        {
-            OutputDir = await _dialogService.ShowOpenFolderDialogAsync("Choose Output Folder");
-        }
-
-        private void FuseNxDump()
-        {
-            _fuseService.FuseUpdateEvent += OnFuseServiceUpdate;
-            _fuseService.FuseSimpleLogEvent += OnFuseServiceSimpleLogEvent;
-            _sw.Start();
-            try
-            {
-                _fuseService.Start(InputFilePath, OutputDir);
-            }
-            catch (Exception e) {
-                _sw.Stop();
-                OnFuseServiceSimpleLogEvent(new FuseSimpleLog(FuseSimpleLogType.Error, DateTime.Now, e.Message));
-            }
-        }
-
-        private void StopDump()
-        {
-            _sw.Stop();
-            _fuseService?.Stop();
-            ProgressText = string.Empty;
+            set => this.RaiseAndSetIfChanged(ref _logItems, value);
         }
 
         private void ClearLog()
@@ -128,14 +115,21 @@ namespace nxDumpFuse.ViewModels
             LogItems.Clear();
         }
 
+        private void OnFuseServiceSimpleLogEvent(FuseSimpleLog log)
+        {
+            LogItems.Add(log);
+        }
+
         private void OnFuseServiceUpdate(FuseUpdateInfo fuseUpdateInfo)
         {
             if (fuseUpdateInfo.Complete)
             {
                 _sw.Stop();
                 ProgressText = string.Empty;
+                IsBusy = false;
                 return;
             }
+
             ProgressPart = fuseUpdateInfo.ProgressPart;
             ProgressPartText = $"Part {fuseUpdateInfo.Part}/{fuseUpdateInfo.Parts}";
             Progress = fuseUpdateInfo.Progress;
@@ -146,9 +140,38 @@ namespace nxDumpFuse.ViewModels
             ProgressText = $"({fuseUpdateInfo.Speed:0}MB/s) {Progress:0}% ";
         }
 
-        private void OnFuseServiceSimpleLogEvent(FuseSimpleLog log)
+        private async void SelectInputFile()
         {
-            LogItems.Add(log);
+            InputFilePath = await _dialogService.ShowOpenFileDialogAsync("Choose Input File",
+                new FileDialogFilter { Name = string.Empty, Extensions = new List<string>() });
+        }
+
+        private async void SelectOutputFolder()
+        {
+            OutputDir = await _dialogService.ShowOpenFolderDialogAsync("Choose Output Folder");
+        }
+
+        private void StartFuse()
+        {
+            IsBusy = true;
+            _sw.Start();
+            try
+            {
+                _fuseService.Start(InputFilePath, OutputDir);
+            }
+            catch (Exception e)
+            {
+                _sw.Stop();
+                OnFuseServiceSimpleLogEvent(new FuseSimpleLog(FuseSimpleLogType.Error, DateTime.Now, e.Message));
+            }
+        }
+
+        private void StopFuse()
+        {
+            _sw.Stop();
+            _fuseService.Stop();
+            ProgressText = string.Empty;
+            IsBusy = false;
         }
     }
-}
+}
\ No newline at end of file
diff --git a/src/nxDumpFuse/Views/FuseView.axaml b/src/nxDumpFuse/Views/FuseView.axaml
index f3b48e6..7eb8410 100644
--- a/src/nxDumpFuse/Views/FuseView.axaml
+++ b/src/nxDumpFuse/Views/FuseView.axaml
@@ -27,7 +27,7 @@
 
             <StackPanel Grid.Row="4" Grid.Column="1" Grid.ColumnSpan="2" Orientation="Horizontal"
                         HorizontalAlignment="Right">
-                <Button Command="{Binding FuseCommand}" Content="Fuse" />
+                <Button Command="{Binding StartCommand}" Content="Fuse" />
                 <Button Command="{Binding StopCommand}" Content="Stop" />
             </StackPanel>