C# Unable to delete registry key in Win 7 64 Bit PC

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C#2.0

C#

Windows

Win7

64-bit

, +

Hello All,

I am unable to delete a particular registry key from Win 7 64 bit. The deletion command result is successful but when i go and check in registry, the entry exists.
In Win7 32 bit and other OS, it runs fine-deletes successfully. The problem is in 64 bit OS.
Below is the code snippet:

RegistryKey registrykeyHKLM = Registry.LocalMachine;
          string keyPath = @"Software\Microsoft\Windows\CurrentVersion\Uninstall\InstallShield_{3BFAF362-6DB8-46EA-98BB-713388534EB1}";

          RegistryKey rk2 = Registry.LocalMachine.CreateSubKey(keyPath);

          if (rk2 != null)
          {
              errlog.WriteLogMsg("Found the registry: " + keyPath);
              // Deleting uninstall registry key entries
              registrykeyHKLM.DeleteSubKey(keyPath);
          }

          rk2.Close();
          registrykeyHKLM.Close();

          //Checking for successful deletion of Uninstall registry keys
          try
          {
              RegistryKey rk = Registry.LocalMachine.OpenSubKey(keyPath,true);

              if (rk != null)
              {
                  errlog.WriteLogMsg("Registry found. Unable to delete registry key: " + keyPath);
                  errlog.WriteLogMsg("Failed to delete Uninstall Information Registry Entries!!!");
                  //MessageBox.Show("Failed to delete Uninstall Information Registry Entries!!!");//2.0.0 (DKD)
              }
              else
              {
                  errlog.WriteLogMsg("Successfully deleted registry key: " + keyPath);
              }
          }
          catch (Exception ex1)
          {
              errlog.WriteLogMsg("Exception while deleting registry entries");
              errlog.WriteErrorLog(ex1);
          }

NOTE: The registry entry which i am trying to access is not in Wow6432 node.. its in a common place in both 64 & 32 bit machines. But still i am not able to delete that particular key in 64 bit machine. The keyPath which iam trying to access is common for both 64 bit and 32 bit,i can read,modify the value but iam not able to Delete the key

Please help
Thanks & regards
Dinesh