My Sony vaio running windows 7 (home basic sesrvice pack 1 64bit 4GB RAM) shuts down frequently and the CPU usage is 100% most of the time. The media player (smplayer,VLC) lags then hangs and then machine shuts down when started windows shows bluescreen error code. Firefox (V43) used lot of memory so switched to chrome still problem exists. any help in layman terms would be really helpful.