CentOS5.1安装问题

废了我两张DVD了第一张提示
Isolinux:disk error 10, x = 4254,drive EF
Boot failed: press a key to retry


又下了了一次到开始安闭的时候又提示
The file vim-enhanced-7.0.109-3.e15.3.x86_64.rpm cannot be opened. This is due to a missing file,a corrupt package or corrupt media.please verify your installation source.
If you exit,your system will de left in an in consistent state that will likely require reinstallation.
真是服了```那位朋友能说说这是怎么回事吗？