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Product Keys can be used for either 32- or 64- bit.
Leave the Product Key blank if requested during in-place Upgrade from Vista HP to Win7 HP.
Use eicfg_removal_utility.zip on the ISO extracted from your DVD using ImgBurn. ImgBurn - Free software downloads and software reviews - CNET Download.com.
Then burn an all-versions DVD using ImgBurn at 4x speed with Verify.
You can also clean install following these steps: Clean Install Windows 7