Windows Resource Protection (WRP) has replaced Windows File Protection (WFP) in Windows Vista. While the SFC.EXE tool is still available, there are some significant changes in it's syntax (but SFC.EXE /SCANNOW will still work).

Here's a link for it: http://msdn2.microsoft.com/en-us/library/aa382503.aspx

A comparison between what's protected in Vista and what's protected in other Windows versions: http://msdn2.microsoft.com/en-us/library/aa382530.aspx

The SFC.EXE syntax: http://msdn2.microsoft.com/en-us/library/aa382541.aspx