Vista - Problem reading the registry

Hi,

I'm using Microsoft Virtual PC 2007, with Windows 2000 SP4 loaded, to
test some software. I need to read the registry from a DLL created from
C/C++, but when I run it this happens:

RegOpenKeyEx returns a 2, and GetLastError returns 0xb7 - "Cannot create
a file when that file already exists."


My code is:

static HKEY OpenRegistryUser()
{
**HKEY hKey;
**LONG status;
**//Open the Registry keys
**status = RegOpenKeyEx(HKEY_CURRENT_USER,
*****TEXT(RegString),
*****0,
*****KEY_READ,
*****&hKey);
**if( status != ERROR_SUCCESS )
**{
*****DWORD lastError = GetLastError();
*****LPVOID lpMsgBuf;
*****FormatMessage(
*********FORMAT_MESSAGE_ALLOCATE_BUFFER |
*********FORMAT_MESSAGE_FROM_SYSTEM |
*********FORMAT_MESSAGE_IGNORE_INSERTS,
*********NULL,
*********lastError,
*********MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
*********(LPTSTR) &lpMsgBuf,
*********0,
*********NULL
*****);
**}
**return hKey;
}


I can run the above-mentioned DLL on a WinXP machine, and the call
works. I don't have any development tools installed on my virtual PC,
so I can't research the accuracy of the source code.

Can anyone tell me what's wrong? Or perhaps provide some source code
that runs on a VirtualPC to read a Win2000 registry?

Thanks in advance for any help ...


B