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#11
The reason this is important is because the error you got almost always means the DVD is bad, either burned wrong or the ISO wasn't full and complete.
Where did you download the ISO from and how was it burned to DVD?
Win7 Pro x64 should download around 3.1 gb to be complete, should be an ISO file that you burn to DVD using a specialized tool like ImgBurn or Windows 7 USB-DVD Download Tool
I saw you were looking at the Slipstream SP1 tutorial but that isn't necessary since the official Windows 7 Direct Download Links all have SP1 and latest media refreshed.
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