无法安装MATLAB7.0

各位大侠:
我在安装MATLAB7.0时,点击SETUP后,弹出如下提示:
The installer cannot read the mwinstall.dll file, This is probably due to a CD reader which can
only read files with an eight.three naming convention.
Please see the technical support page at www.mathworks.com
for assistance.
请问什么原因啊,之前我也装过,都是好的啊,现在重新安装就这样了
紧急求助啊!谢谢