R and mysql

Hi all,
     I want to visit MySQL in R use RMySQL package on Windows 2k.I got
RMySQL and DBI packages from a cran,but only the package  RMySQL  is
built on MasOS.I extracted both and put them under the folder of
"library",started R and typed string as ,

require(RMySQL);

R told me DBI was loaded,but RMySQL  was't loaded because R not found it.


Thank very much!
  along