I\'m a complete n00b on Rails with only beginner knowledge of Ruby. I plan on studying Ruby more before I really learn Rails, but I\'m waayy too curious for my own good.
I'd the same problem on a x64 win 7.
Solution (for me):
1) Install sqlite3
gem install sqlite3
2) Check the installed version
gem list sqlite3
It gives me: sqlite3 (1.3.8 x64-mingw32)
3) Modify the Gemfile.lock
I change "sqlite3 (1.3.8-x86-mingw32)" by "sqlite3 (1.3.8-x64-mingw32)
It works :) Note that you to need add a "-" between the version number and the x64 in the Gemfile.lock
Xmass