questionswhat should i do with a spare copy of win7 pro?

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sell it on ebay or craigslist.

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If you don't need the money from reselling it, you could think about donating it. I'm sure there are plenty of schools and nonprofits that would appreciate the chance to update the OS on one of their computers for free.

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Do you have a table with an uneven leg? It might be a great shim.

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I think you should build a second (bigger, better) computer and use the software on that one.

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I think donating it to a small charity would be commendable.

If not, then you can always make it a holiday gift to the geek in your family who's still running Vista.