Rails - May 2011 - This is abhilash here need help...in installing rubygems...finding some error

Hi i have installed Cygwin as instructed on the tutorial of  Maichel
Hartl on the windows Xp suscessfully...
in the next step i openned the link http://rubyforge.org/frs/?group_id=126
from where i selected the rubygems-1.8.1.tgz.
Then when i typed ls for which i got the msg as rubygems-1.8.1
till here....things were fine...
after this what should i do....pl instruct me on how to go ahead from
here..

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