HI.How to install instal qtruby4-1.4.9-mswin32.gem with gem?

[casper_the_ghost]

HI:
i want to use qtruby.how to install?i try type “gem insall
qtruby…”,it give me “ERROR: Error installing gem qtruby4-1.4.9-
mswin32.gem[.gem]: buffer error”