diff -r 69dfa910e628 -r 03d3325e85d4 Hardware/Nvidia/NvidiaGroup.cs
--- a/Hardware/Nvidia/NvidiaGroup.cs	Sat May 15 11:09:02 2010 +0000
+++ b/Hardware/Nvidia/NvidiaGroup.cs	Sat May 15 11:20:50 2010 +0000
@@ -55,7 +55,13 @@
 
       NvPhysicalGpuHandle[] handles = 
         new NvPhysicalGpuHandle[NVAPI.MAX_PHYSICAL_GPUS];
-  
+
+      if (NVAPI.NvAPI_EnumPhysicalGPUs == null) {
+        report.AppendLine("Error: NvAPI_EnumPhysicalGPUs not available");
+        report.AppendLine();
+        return;
+      }
+
       int count;
       if (NVAPI.NvAPI_EnumPhysicalGPUs(handles, out count) != NvStatus.OK)
         return;