CRegKey and Vista permissions

[C++ Programming]

I'm trying to call

CRegKey regKey;
dwError = regKey.Create(HKEY_LOCAL_MACHINE, _T("...my path..."));

...but Create() is returning ERROR_ACCESS_DENIED. Thius is under Vista running as a user. Under XP it is fine. Is it possible to create a registy entry in KCLM? How can I grant it access?

Thanks,

Jeff