Hello.First of all,sorry to Tashi for wrongly send PM to Blade81.It's because I've been used the method on this forum,before.Back to my problems.Some 2-3 days ago,I've installed McAfee security suite (that I bought).I ran the scanner for the first time install,and it goes well for 2-3 minutes before my laptop shut down automatically for no reason.Fearing something goes bad,I ran again the scanner drive by drive.It goes well.The problems is,everyday there will be routinely scanning process that run,sometimes when I was in the middle of doing something with the laptop.It really give me trouble when you are browsing,then it shutdown just like that.Perhaps it getting worse,when today while I was browsing and open more than 5 tabs,it happen.There's also another problem, sometimes on my screen there some kind of white shadows appear.And when this happen the font and whatever appear on the screen shaking for a second, like the power supply not sufficient.Could anyone help me?