I tried to udpate rails from windows using instant Rails, using the follwing statement:
gem update --system
but an error appears and I don't know what's the problem. Is there other ways to update it or solving the probelm?
First, I wouldn't recommend using InstantRails for any type of Ruby programming on Windows. There are far better ways to install Ruby and the necessary components on Windows.
A. www.rubyinstaller.orgB. http://pragmaticstudio.com/blog/2010/9/23/install-rails-ruby-windows
Second, we could help troubleshoot better if we knew what the error said. However, I HIGHLY suggest installing Ruby and Rails as described in the links above.