Thanks, I have done the same for Internet Explorer
require 'rubygems'
require 'watir-webdriver'
browser = Watir::Browser.new :internet_explorer
C:\Ruby193\bin\ruby.exe -e $stdout.sync=true;$stderr.sync=true;load($0=ARGV.shift) D:/S.K.C/Cucumber/programs/learn_watir/third_script.rb
C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/remote/response.rb:52:in `assert_ok': Unexpected error launching Internet Explorer. Protected Mode settings are not the same for all zones. Enable Protected Mode must be set to the same value (enabled or disabled) for all zones. (Selenium::WebDriver::Error::NoSuchDriverError)
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/remote/response.rb:15:in `initialize'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/remote/http/common.rb:59:in `new'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/remote/http/common.rb:59:in `create_response'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/remote/http/default.rb:66:in `request'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/remote/http/common.rb:40:in `call'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/remote/bridge.rb:640:in `raw_execute'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/remote/bridge.rb:101:in `create_session'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/remote/bridge.rb:68:in `initialize'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/ie/bridge.rb:48:in `initialize'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/common/driver.rb:35:in `new'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver/common/driver.rb:35:in `for'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.44.0/lib/selenium/webdriver.rb:67:in `for'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-webdriver-0.6.11/lib/watir-webdriver/browser.rb:46:in `initialize'
from D:/S.K.C/Cucumber/programs/learn_watir/third_script.rb:4:in `new'
from D:/S.K.C/Cucumber/programs/learn_watir/third_script.rb:4:in `<top (required)>'
from -e:1:in `load'
from -e:1:in `<main>'
Process finished with exit code 1