我电脑中毒了，查出是C:\Windows下的smss.exe。删了后exe文件都打不开，双击就让我选择打开方式。

smss.exe is a process which is a part of the Microsoft Windows Operating System. It is called the Session Manager SubSystem and is responsible for handling sessions on your system. This program is important for the stable and secure running of your computer and should not be terminated.
PS：smss.exe is also a process which is registered as a number of trojans and mass mailing worms, and the PWSteal.Wowcraft.B Password stealer. These Trojans allow attackers to access your computer, stealing passwords and personal data. It is a registered security risk and should be removed immediately.
So：etermining whether this process is a virus or a Windows process depends on the directory location it executes or runs from in WinTasks.

你用什么杀毒啊！

是暴龙变种用qqkav
http://www.jsing.net/qqkav/