inspired by http://gist.github.com/213971

Gem::RemoteSourceException

C:\ruby> gem list -r

*** REMOTE GEMS ***
ERROR:  While executing gem ... (Gem::RemoteSourceException)
    HTTP Response 403

C:\ruby> gem update --system
Updating RubyGems...
ERROR:  While executing gem ... (Gem::RemoteSourceException)
    HTTP Response 403

C:\ruby> gem --version
0.9.2

C:\ruby> wget http://rubyforge.org/frs/download.php/60719/rubygems-1.3.5.zip

C:\ruby> 7z x rubygems-1.3.5.zip

C:\ruby> ruby rubygems-1.3.5\setup.rb

C:\ruby> gem --version
1.3.5

C:\ruby> gem list -r

*** REMOTE GEMS ***

_ (1.2)
a2ws (0.1.9)
a_okay (0.1.0)
aaalex-off_github (1.1.2)
aalib-ruby (0.7.1)
aargvark (0.0.15)
aasm (2.1.3)
abebooks4r (0.1.0)
abn (1.3.0)
AbsoluteRenamer (1.1.0)
AbsoluteRenamer-date (0.1.0)
AbsoluteRenamer-system (0.1.0)
abstract (1.0.0)
abstract_analyzer (0.1.2)
abstraction (0.0.3)
...