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!