ProBook 440 G2 14" Touchscreen LED Notebook - Intel Core i5 i5-4210U 1.70 GHz

i bought it in 700$ few days ago. Two major problems that I unable to rectify, first its trackpad is having a very slow response despite of all the settings and instruction. Second, its wifi is not dual band as it only detects wifi signals from 2.5GHZ. Sound is also not up to HP standard. I would prefer Lenovo laptop quality that are more cheaper then HP.