diff --git a/Hardware/ATI/ADL.cs b/Hardware/ATI/ADL.cs
index b594031..51f14f2 100644
--- a/Hardware/ATI/ADL.cs
+++ b/Hardware/ATI/ADL.cs
@@ -162,7 +162,7 @@ namespace OpenHardwareMonitor.Hardware.ATI {
       where T : class 
     {
       DllImportAttribute attribute = new DllImportAttribute(dllName);
-      attribute.CallingConvention = CallingConvention.StdCall;
+      attribute.CallingConvention = CallingConvention.Cdecl;
       attribute.PreserveSig = true;
       attribute.EntryPoint = entryPoint;
       PInvokeDelegateFactory.CreateDelegate(attribute, out newDelegate);
diff --git a/Hardware/OperatingSystem.cs b/Hardware/OperatingSystem.cs
new file mode 100644
index 0000000..6cc2b34
--- /dev/null
+++ b/Hardware/OperatingSystem.cs
@@ -0,0 +1,38 @@
+/*
+ 
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ 
+  Copyright (C) 2012 Michael Möller <mmoeller@openhardwaremonitor.org>
+	
+*/
+
+using System;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+
+namespace OpenHardwareMonitor.Hardware {
+  internal static class OperatingSystem {
+
+    public static bool Is64BitOperatingSystem() {
+      if (IntPtr.Size == 8)
+        return true;
+
+      try {
+        bool wow64Process;
+        bool result = IsWow64Process(
+          Process.GetCurrentProcess().Handle, out wow64Process);
+
+        return result && wow64Process;
+      } catch (EntryPointNotFoundException) {
+        return false;
+      }
+    }
+
+    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool IsWow64Process(IntPtr hProcess,
+      out bool wow64Process);
+  }
+}
diff --git a/Hardware/Ring0.cs b/Hardware/Ring0.cs
index 48d4797..d03893b 100644
--- a/Hardware/Ring0.cs
+++ b/Hardware/Ring0.cs
@@ -4,7 +4,7 @@
   License, v. 2.0. If a copy of the MPL was not distributed with this
   file, You can obtain one at http://mozilla.org/MPL/2.0/.
  
-  Copyright (C) 2010-2011 Michael Möller <mmoeller@openhardwaremonitor.org>
+  Copyright (C) 2010-2012 Michael Möller <mmoeller@openhardwaremonitor.org>
 	
 */
 
@@ -75,7 +75,8 @@ namespace OpenHardwareMonitor.Hardware {
 
     private static bool ExtractDriver(string fileName) {
       string resourceName = "OpenHardwareMonitor.Hardware." +
-        (IntPtr.Size == 4 ? "WinRing0.sys" : "WinRing0x64.sys");
+        (OperatingSystem.Is64BitOperatingSystem() ? "WinRing0x64.sys" : 
+        "WinRing0.sys");
 
       string[] names =
         Assembly.GetExecutingAssembly().GetManifestResourceNames();
diff --git a/OpenHardwareMonitorLib.csproj b/OpenHardwareMonitorLib.csproj
index 5e46a02..a590237 100644
--- a/OpenHardwareMonitorLib.csproj
+++ b/OpenHardwareMonitorLib.csproj
@@ -92,6 +92,7 @@
     <Compile Include="Hardware\LPC\NCT677X.cs" />
     <Compile Include="Hardware\Mainboard\GigabyteTAMG.cs" />
     <Compile Include="Hardware\Opcode.cs" />
+    <Compile Include="Hardware\OperatingSystem.cs" />
     <Compile Include="Hardware\Ring0.cs" />
     <Compile Include="Hardware\KernelDriver.cs" />
     <Compile Include="Hardware\Hardware.cs" />