Repair Windows 7 with non original installation disc

Jul 22, 2015
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Help please.
I wish to repair my current widows 7 installation by running an upgrade install. My original disc does not contain SP1. Can I use a disc that I have that does contain SP1 if I use the product key for the original disc. I have both discs and both keys.Will it matter that the versions differ in the absence/presence of SP1 ? I have seen it suggested that the key has to be for an absolutely identical version of Windows down to presence or absence of SP1. Both discs are Home Premium and 32 Bit.

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