I purchased HP Ac 122 laptop a few weeks ago, the saler installed windows 8.1 pro cracked version,as they usually do. But when the start my lappy , HP logo appears , suddenly. The screen becomes black after a few minutes ( after 4 mins to 15 mins) again slowly the window starts, then appear the desktop. I told this to the sailor but he said this HP series in not compatible with win 8.1 , either use win 7 or 10 , I am not software savvy. I am still not able to use my lappy.pls guide me what to do? What may be the reason for the said problem??