You can find mdac on
http://www.microsoft.com/data/I had a similar problem with odbc this week, the odbc icon in the control panel didn't work anymore. when i clicked it it showed an hourglass for one second and terminated. Reinstalling mdac from the page above worked fine for me.
best luck,
Hennie
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'C' is shorthand for Confusion, 'C++' much more confusion...