The problem of installing Fedora 14

I am so confusing. And I can't type Chinese now, so please help me if you can and tell me in Chinese.
The problem problem is 
>>>>>>>>>>>>>
There was an error installing the live image to your hard drive.This could be due to bad media.Please verify your installation media.
If you exit, you system...
<<<<<<<<<<<<<
I don't kown why. It aboslutely made me crazy!
Help!!!

你下载的iso镜像文件用md5检查过没,