Can read and copy from a DVD but not Install from it

I've come across an issue in Win 7 where I cannot install from a DVD or a mounted dvd image (e.g. poweriso). The installer will kick up, start to do its think then it will throw a generic error. Interestingly enough, if I copy the contents of the DVD to the Hard Drive and execute the install program from there, everything works fine. Anyone have any idea why Windows 7 would behave like this?
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More about read copy install
  1. This could be due to several causes, the most likely is that you have corrupted media. Other causes could be a faulty power supply, faulty memory, or faulty DVD drive or interface.
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