New
#21
The official word that I got from Microsoft support;
"Windows detected that one or more of it's protected system file(s) has been modified (rewritten, replaced or become corrupt) and that when Windows tried to repair the files, it failed. These files can no longer be trusted because they have been modified in some way. Or in other words, the files are Non-Genuine."
After searching the threads here, it seems to be a fairly common issue with Win 7.