我的电脑也出现了LSA SHELL问题,应该怎么办啊?急啊!

I started my pc today and everything was fine. I played some unreal and when I quited I got an error on LSA Shell(Export version).
When I closed the error Windows said my system had to be rebooted and a countdown was running (60sec).

I rebooted and got the same error. I allready have checked for virusses and trojans but now I allwas get the error when I boot.Everything works fine untill I close the error and the countdown begins again.