急！急！急！文件下载后打不开，来救我啊！
在网吧里文件下载后打开出现这样的对话框：the installer you are trying to use is corrupted or incomplete,this could be the result of the result of a damaged disk,a failed download or a virus .you may want to contact the author of this installer to obtain a new copy .it may be possible to skip this check using the /NCRC command line switch （NOT RECOMMENDED)怎么了，怎样才能打开？
