Thank you so much! 这病毒叫 SYSTEM CHECK，恶性度很大。GOOGLE能找到解法。

解法1：ACTIVATION CODE MOST USEFUL

http://deletemalware.blogspot.com/2011/12/remove-system-check-uninstall-guide.html

 

解法2：

http://www.myantispyware.com/2012/01/02/how-to-remove-system-check-virus/

 

I used one -- worked well thus far. But some issues remained. The computer seems working ok now, but it is never the same as before it was infected. Thank you very much for your help!