It will not work, that is a OEM key, and while not to that system, it is married to the computer you are talking about because it has been activated in advance for you, sorry
Linux is a very nice option if you don't want to buy windows, I agree with using Ubuntu, i use it on my second PC exclusively because it had Vista, and it runs WELL on it because of all the specifications vista needs
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Now to answer your concerns about reusing keys: the key is MARRIED to the system installed on, no matter what you do
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BUT if the hardware matches, it will work in the end, but it has to be the EXACT same hardware
I would buy the 7 builder's copy for 100.00,
It will not work, that is a OEM key, and while not to that system, it is married to the computer you are talking about because it has been activated in advance for you, sorry
here is the 64 bit
http://www.amazon.com/Windows-Premium-64bit-System-Builder/dp/B004Q0PT3I/ref=sr_1_1?ie=UTF8&qid=1331923554&sr=8-1
32 bit
http://www.amazon.com/Windows-Premium-32bit-System-Builder/dp/B004Q0T10A/ref=pd_cp_sw_3
Linux is a very nice option if you don't want to buy windows, I agree with using Ubuntu, i use it on my second PC exclusively because it had Vista, and it runs WELL on it because of all the specifications vista needs