HONG KONG (Reuters) – Shares in Lenovo Group Ltd fell as much as 15 percent on Tuesday after a weekend media report said the Chinese personal computer maker was in talks with Japans Sony Corp about a possible joint venture to buy Sonys loss-making Vaio PC business overseas. Lenovo shares were down 12.5 percent at HK$8.80 by 0205 GMT, adding to last Thursdays 8.2 percent fall. Japanese electronics and media giant Sony Corp called the report inaccurate but acknowledged it was looking at various possibilities for Vaio. Lenovo could not be reached for an immediate comment. …