Got 900 Google hits searching on the string and this is typical.

http://www.pcreview.co.uk/forums/thread-1791066.php

Mike

"George C" wrote:

I keep getting a Visual Basic error every time I open Excel or an associated
excel file.It says Class not registered. Looking for
CLSID;{AC9F2F90-E877-11CE-9F68-00AA00574A4F. Tried Office XP repair.
Completly removed and re-installed. No help. Anyone with similar problem that
can help?