mcdf
I wonder if you have read these articles. Apparently you have a new version of 'Whistler" which was only released for "beta" testing
<a target="_blank" href=http://www.nwfusion.com/news/2000/0321whistler.html>Microsoft's Whistler gets unscheduled debut</a>
<a target="_blank" href=http://www.zdnet.com/zdnn/stories/news/0,4586,2471310,00.html>Windows 2001 leaked on the Web</a>
The reason you cannot find the file seems to be explained as follows:
<blockquote><font class="small">In reply to:</font><hr>
Just one small comment. For some reason marscore.dll is named marspch.dll and
can be found in Win_12.cab. This means one cannot use MSConfig to replace it,
even in Safe Mode. The file needs to be extracted from the cab by hand, renamed
and then used to replace the possibly corrupt file whilst in Safe Mode.
<hr></blockquote>
That being said Microsoft Knowledge Base seems to offer some support
<a target="_blank" href=http://support.microsoft.com/default.aspx?scid=kb;EN-US;q269244>Error Message When You Quit the Help and Support Tool</a>
Good Luck
Smitty