"Since at least September, Lenovo has been shipping OEM Windows laptops preloaded with Superfish “adware,” which would rudely inject its own shopping results into your browser when you searched on Google, Amazon, and other websites. This sort of behavior is associated more with spyware than with factory-shipped operating-system installs, and by itself would be a new low for Lenovo. But Superfish is more than just pesky. It’s the most virulent, evil adware you could find."
How bad? This bad: