The superfish software shipped with Lenovo laptops can intercept and redirect your secure browsing sessions (eg to your bank) so that third parties can hijack them.
You can test to see if your Lenovo product is infected, how to do so is included in the link below. It can also be removed, again instructions in the link.
Lenovo for years has been known as (one of) the best laptop makers out there. I use one and have recommended them to many of my friends. This brand is hugely popular with IT professionals. This changes everything. Any company that allows spyware to be shipped on their systems and then denies it goes onto my boycott list – just like Sony is. This is a real disaster.