Suggestions

Hello,
my computer is working only in safe mode,i tried restarting it many times to make it work in normal mode but no use......when i start the computer its showing the screen to start windows normally,safe mode,last known good config...etc.Actually the problem occured when i was playing GTA san andreas when i pressed the Esc button a blank screen appeared for some time so i restarted my system, from then onwards am facing this problem.Can anyone suggest me a solution for this .........