I just had the same issue on Vista. When running things via the command line, you need to run them as administrator even if your account is an administrative account.
When expecting to install things via the command line, just to goto the Vista Start Search Edit box, type 'cmd' and instead of hitting 'enter', hit cntr+shift+enter to launch it with admin privaliges.
No problems installing after that.
Best of luck
Hi trying to install rails, but get this error...
C:\ruby>gem install rails --include-dependencies
ERROR: While executing gem ... (Errno::EACCES)
Permission denied - c:/ruby/bin/rails
Can anyone help?
OS is Vista.
JamesR