I have a 3 year old Acer Aspire 4752G which runs flawlessly until this week. On February I updated it to Windows 8.1 pro due to a suggestion. However, starting from last week, one problem, which happened quite rare, had become more and more often. My laptop would just shut down randomly before I could do anything and then restarts. I've tried updating all my drivers, uninstalling softwares, ran antivirus and anti malware but all effort is worthless. I searched the web for solution but none seems to work. I even tried to boot into safe mode and all I get is a black screen. I do however managed to get to event viewer. In it, I saw a lot of rectangles with exclamation mark and also quite a few 'Critical' error. It says Kernel Power error 41 (63) if I'm not mistaken. I really really need this laptop to work as most of my assignment is in it.