How to auto logon windowsxp in winlogon notification package?

Hi all
I have write a winlogon notification package for WindowsXP. It will show a
dialog in Startup event. And I want login automatically, how to do this?
I have written the flowing code in startup callbak

LogonUser( TEXT("Administrator"),NULL,TEXT("111"),
LOGON32_LOGON_INTERACTIVE,LOGON32_PROVIDER_DEFAULT,&hToken);

HDESK hDesk = ::CreateDesktop( _T("WinSta0\\Default"), NULL, NULL,
DF_ALLOWOTHERACCOUNTHOOK, GENERIC_ALL, NULL );

SwitchDesktop( hDesk );
bRet = ::CreateProcessAsUser( hToken,

NULL, _T("explorer.exe"), NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi );



It will get BSOD at CreateProcessAsUser. Is there some thing I missed? How
can I do this?



Thanks very much.