I was trying to install “bcrypt-ruby” on Windows 8, 64 bit .
Tried a lot of configurations, ranging from different versions of the gem, direct from git, platform ruby etc.
But nothing worked
At the end installed DEVKIT compatible to my ruby version and thats it.
Install Devkit compatible to your ruby version
Then on command line go to above path
gem install bcrypt-ruby
This should install it,
Post this, you need to add the gem to your Gemfile and say
bundle install bundle update bundle install
This should work fine. Also solves update issues related to active_record etc.
The same should work for WIN 64, WIN 32 also.