I am using W7 64bit. Simply put, when I enter:
C:\\Sites>gem install libv8
I get this result:
Temporarily enhancing PATH to
I had the same windows problem that you described with:
gem 'twitter-bootstrap-rails'
When I switched this the version from github:
gem 'twitter-bootstrap-rails', :github => 'seyhunak/twitter-bootstrap-rails'
No problem. Give that a shot.