Windows SDK Registry: How can I write data to the registry?

HKEY hKey;

if(::RegOpenKeyEx(HKEY_LOCAL_MACHINE,
"System//CurrentControlSet//Control//Windows",
0,
KEY_SET_VALUE,
&hKey) == ERROR_SUCCESS)
{
DWORD dwValue = 245;

// Set value
if(::RegSetValueEx(hKey,
"NameOfValue",
0,
REG_DWORD,
reinterpret_cast<BYTE *>(&dwValue),
sizeof(dwValue)) != ERROR_SUCCESS)
{
// Close key
::RegCloseKey(hKey);

// Error handling;
}

// Close key
::RegCloseKey(hKey);
}
else
// Error handling;