Estou usando o Windows XP SP2 e instalei o Ruby através do Ruby 1.9, um instalador de clique. Então quando tento usar o ri, recebo a seguinte resposta, alguém pode me ajudar com o meu problema?

C:\Documents and Settings\eyang>ruby --version
ruby 1.9.1p243 (2009-07-16 revision 24175) [i386-mingw32]

C:\Documents and Settings\eyang>ri --version
ri 2.2.2

C:\Documents and Settings\eyang>ri String
Updating class cache with 0 classes...
Nothing known about String

C:\Documents and Settings\eyang>ri
Updating class cache with 0 classes...
No ri data found

If you've installed Ruby yourself, you need to generate documentation using:

  make install-doc

from the same place you ran `make` to build ruby.

If you installed Ruby from a packaging system, then you may need to
install an additional package, or ask the packager to enable ri generation.

C:\Documents and Settings\eyang>

By the way, quando eu tento usar gem, eu tenho as seguintes mensagens de erro também, alguém pode explicar isso?

C:\Documents and Settings\eyang>gem --version
1.3.5

C:\Documents and Settings\eyang>gem query --remote

*** REMOTE GEMS ***

ERROR:  While executing gem ... (Errno::ENOMEM)
    Not enough space - <STDOUT>

C:\Documents and Settings\eyang>