Hi Bill,
If a previously installed updated patch (.msp) file is
corrupted or damaged you may want to try doing a repair/reinstall
from the MS Office (version?) listing in Add/Remove Programs
in the Windows control panel. If that does not succeed then
use the cleanup utility to clear the registry for MS Office then
do the repair/reinstall.
http://support.microsoft.com/default.aspx?scid=kb;en-us;295823
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Office won't update- error message - mainsp03.msp missing >>
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Let us know if this helped you,
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
For Everyday MS Office tips to "use right away" -
http://microsoft.com/events/series/administrativetipsandtricks.mspx