Newbie question - Problems in installing rails

C:>gem -v

C:>gem install rails --include-dependencies
Bulk updating Gem source index for:
ERROR: While executing gem … (OpenURI::HTTPError)
404 Not Found

I am getting the error above when trying to install rails. Any ideas.
Thanks in advance,

Are you bebind a fire wall?
you may need to set the environment variable http_proxy to the proper
proxy server.

2007/11/25, [email protected] [email protected]: