This dll is involved with digital certificates on a running OS, it is not involved with setup.
To expand more on what acus said, do a global replace in both TXTSETUP and LAYOUT of ,_x, to ,, (comma underscore x comma ---> comma comma)
Hacking SFC is handy but doesn't relate to wintrust. This may be handy for you, it is buried in my site
edit: by "This dll is involved with digital certificates on a running OS, it is not involved with setup" I mean there is nothing you can do during setup to suppress errors from this dll later. An error thrown because of this means another dll that windows is attempting to verify is failing verification. So strictly speaking, another dll might be the actual problem.
This post has been edited by fdv: 28 September 2012 - 12:48 PM