Lenovo — My laptop hangs a lot

The laptop which i purchased is the worst laptop.It always stucks or hangs a lot.I tried contacting lenovo customer care and live chat they did response but did not cleared my problem.when i call or chat with them they tell me to re-install the operating system but after doing that, am not satisfied because my problem is not cleared, they even tell me to scan hardware in their separate software called as lenovo solution center and i see the warning result. but the lenovo team told me that warning result is negligible. every time when i call the lenovo they tell me to re-install and tell me to scan the hardware.I did it many times and now finally am tired and not interested in calling them again and again.now finally i want my laptop to be free from hanging here's my configuration of my laptop: Processor : intel i3 4030u RAM: 4gb HDD : 1TB Graphics : 4gb I request you to resolve my complaint.