NISI Error
The insaller 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)
我的电脑开机后进入XP画面后出现以上对话框，用瑞星查毒查后开机还有这个对话框．
该怎么办啊？

[用户系统信息]Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)