我最近update了XP之后就不能安装emule和BT类软件

系统一再提示NSIS Error
The installer you are trying to use is corrupted or incomplete. This could be 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).

其他软件都可以安装,真奇怪!! 有谁遇到过这样的事情?