I got hp pavilion gaming 15 had no issues was working great i also have upgraded my ram to 16gb, but now out of the very sudden i noticed there was no Nvidia control panel in the taskbar so i checked the task manager and my graphics card was not there then i checked device manger it shows "Windows has stopped this device because it has reported problems. (Code 43)". i need help with this as soon as possible as i am a student from computer science field i will be required to do intensive task on my notebook so any help would be appreciated .