For doing :

sysprompt> require rails


install that :
>type require.bat

@gem install --no-rdoc -no-ri %1 %2 %3 %4 %5 %6 %7 %8 %9


:)


.

Read more: http://feeds.dzone.com/~r/dzone/snippets/~3/RKywIp2LiUw/13447