After getting caught putting a piece of malware called Superfish on all their laptops, Lenovo has offered apologies and released a removal tool with which to remove it. Leo says that Lenovo had been putting malware on its machines that makes it possible for a 'man in the middle attack' to reroute customer's personal traffic to Lenovo so that it can insert ads. Leo says that's inexcusable and nobody should ever buy a Lenovo brand computer again.
Leo says that while you can't really trust Lenovo to make this right, they have listed laptops infected and is providing a removal tool on its website here - http://support.lenovo.com/us/en/product_security/superfish. Users can also update Microsoft Defender to remove it - http://www.neowin.net/news/microsoft-updates-windows-defender-fries-superfish-like-a-piece-of-carp-that-it-is