When trying to install setuponecare.exe a window appears saying setuponecare(1).exe file is linked to missing export NTDLL.DLL:NtshutdownSystem. Is that a missing file out of Windows? What is the best fix?
My guess would be that you are running a version of Windows that OneCare doesn't support. Supported OS versions are 32-bit Windows XP SP2 and Windows Vista both 32 and 64-bit.
Trying to run the installation with an older Windows version like 9x/ME or 2000 will generate this error as I recall.