回复：WOW，这可是windows的眼睛给挖掉了，呵呵

:-), that's why i get into big trouble. my problem is i don't have 安装盘或恢复盘. i delete this file because my anti-virus software report virus in that file and keep on shutting down my computer. if i don't delete that file, i can only work for at most 5 minutes. :(
anything else to solve the problem? for example, copy the file from another machine? thanks from my deep heart,