Lenovo is the world's top name in PCs, with 20% of computer shipments worldwide. But to insulate itself from a protracted slowdown in PC sales, the company has been trying to earn more money by selling smartphones. As part of that strategy, Lenovo last month completed the acquisition of Motorola Mobility from Google for $2.9 billion. That deal helped catapult Lenovo into the No. 3 spot worldwide, behind only Samsung Electronics and Apple. Lenovo wants to become the leader in the smartphone and mobile devices area. After the company's earnings announcement yesterday, though, investors worried about a slowdown in China have turned skittish about Lenovo.