Added an event handler to save the configuration when the user logs off without closing the application first (http://blogs.msdn.com/b/oldnewthing/archive/2008/04/21/8413175.aspx), because FormClosed is not called in that case.

GUI/CrashReportForm.cs

@@ -38,7 +38,6 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
-using System.Data;
 using System.Drawing;
 using System.IO;
 using System.Net;

GUI/MainForm.cs

@@ -173,8 +173,14 @@ namespace OpenHardwareMonitor.GUI {
 
       // Create a handle, otherwise calling Close() does not fire FormClosed     
       IntPtr handle = Handle;
-    }
 
+      // Make sure the settings are saved when the user logs off
+      Microsoft.Win32.SystemEvents.SessionEnded +=
+        delegate(object sender, Microsoft.Win32.SessionEndedEventArgs e) {
+          SaveConfiguration();
+        };
+    }
+    
     private void SubHardwareAdded(IHardware hardware, Node node) {
       Node hardwareNode = new HardwareNode(hardware);
       node.Nodes.Add(hardwareNode);
@@ -262,8 +268,7 @@ namespace OpenHardwareMonitor.GUI {
       sensorSystemTray.Redraw();
     }
 
-    private void MainForm_FormClosed(object sender, FormClosedEventArgs e) {
-      
+    private void SaveConfiguration() {
       Config.Set(hiddenMenuItem.Name, hiddenMenuItem.Checked);
       Config.Set(plotMenuItem.Name, plotMenuItem.Checked);
 
@@ -274,7 +279,7 @@ namespace OpenHardwareMonitor.GUI {
 
       Config.Set(startMinMenuItem.Name, startMinMenuItem.Checked);
       Config.Set(minTrayMenuItem.Name, minTrayMenuItem.Checked);
-      Config.Set(hddMenuItem.Name, hddMenuItem.Checked);   
+      Config.Set(hddMenuItem.Name, hddMenuItem.Checked);
 
       if (WindowState != FormWindowState.Minimized) {
         Config.Set("mainForm.Location.X", Location.X);
@@ -283,12 +288,17 @@ namespace OpenHardwareMonitor.GUI {
         Config.Set("mainForm.Height", Height);
       }
 
-      foreach (TreeColumn column in treeView.Columns) 
-        Config.Set("treeView.Columns." + column.Header + ".Width", 
+      foreach (TreeColumn column in treeView.Columns)
+        Config.Set("treeView.Columns." + column.Header + ".Width",
           column.Width);
 
-      timer.Enabled = false;
+      Config.Save();
+    }
 
+    private void MainForm_FormClosed(object sender, FormClosedEventArgs e) {
+      SaveConfiguration();
+
+      timer.Enabled = false;
       sensorSystemTray.Dispose();
       notifyIcon.Dispose();
       computer.Close();

OpenHardwareMonitor.csproj

@@ -52,12 +52,10 @@
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Configuration" />
-    <Reference Include="System.Data" />
     <Reference Include="System.Drawing" />
     <Reference Include="System.Management" />
     <Reference Include="System.Web" />
     <Reference Include="System.Windows.Forms" />
-    <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="GUI\CrashReportForm.cs">

Properties/AssemblyInfo.cs

@@ -69,5 +69,5 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.1.35.0")]
-[assembly: AssemblyFileVersion("0.1.35.0")]
+[assembly: AssemblyVersion("0.1.36.0")]
+[assembly: AssemblyFileVersion("0.1.36.0")]

Utilities/Config.cs

@@ -60,7 +60,7 @@ namespace OpenHardwareMonitor.Utilities {
         System.Configuration.ConfigurationUserLevel.None);
     }
 
-    ~Config() {
+    private void SaveConfig() {
       string tempName = Path.ChangeExtension(fileName, ".tmp");
 
       if (File.Exists(tempName))
@@ -73,6 +73,10 @@ namespace OpenHardwareMonitor.Utilities {
       } catch (System.Configuration.ConfigurationErrorsException) { }
     }
 
+    public static void Save() {
+      instance.SaveConfig();
+    }
+
     public static Config Settings {
       get {
         return instance;