虚拟光驱无法安装求助?

我在安装虚拟光驱时 Daemon Tools 时出现如下提示无法安装请指教
NSIS error

The installer you are trying to use is corrupted incomplete

This could be the result of a admaged disk, 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)
问题补充：安装daemon时出现提示NSIS error 错误

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