Sweave not found from MikTeX?

I've been working on a LaTeX document that contains Sweave code and cannot
get MikTeX to find the Sweave.sty file. I've added the c:\rw1081\share\texmf
path in the MikTeX roots (I've ven added the path in the environment
variables ) but to no avail. Is there a trick to getting Sweave installed
correctly when using MikTeX on Windows XP? Do I need to move/copy the
Sweave.sty file to the c:/textmf/?/?/? directory?

Jeff.

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Jeff D. Hamann
Forest Informatics, Inc.
PO Box 1421
Corvallis, Oregon USA 97339-1421
(office) 541-754-1428
(cell) 541-740-5988
jeff.hamann at forestinformatics.com
www.forestinformatics.com