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Windows 7 professional upgrade license/instance questions

I installed windows 7 professional upgrade on my laptop and it's working fine.
I have another pc at home and would like to upgrade this from home premium to professional also.
What are the ramifications of using the same product key?
Sometimes I have my laptop and desktop powered on at the same time at home in the same network. Any problems with this scenario?

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rindi

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Robin CM

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akb

If you have Windows 8 Pro and want to downgrade that to Win 7 Pro you can do that by using an existing Win 7 key on multiple PC's. I have used the same key dozens of times and there are no negatives. Microsoft allow this.

I suspect what the OP wants to do will work but it may not be legal.

brothertruffle880

ASKER

Okay. QUESTION: What do I purchase?
I have a desktop with Windows 7 64 bit home and want to upgrade to professional.
I have a CD with Win 7 64 bit upgrade files and successfully installed it on on my laptop. I had a legitimate license which I installed.
Where do I purchase a license for win7 pro 64 bit upgrade. Since I already have the CD.

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Robin CM

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rindi

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