Last week, I reinstalled Windows 7 and I had problems where they copy files from DVD to my hard drive.
I tried to remove some peripheral devices but it wont help as suggested on some tech website.
This is my trick that worked for me. If your RAM is greater than 4GB, take it out and try the installation again.
It might work for you too. Another things you should consider: burn DVD at 2-4X and check sum of your ISO–make sure it matches with its source