Will this work? Windows 7 swap?

xxxfunnybunnyxxx

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Aug 16, 2014
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Ok so i just recently got all the parts for my new gaming pc but forgot to purchase a copy of windows 7 for it. I have my old 250gb hard drive that i kept for safe keeping and stuff so i was wondering if i take my old hard drive out and put in into my new gaming pc... When i boot it up when im all done building it, will the boot system recognize that i already have windows 7? Or will i have to purchase a new copy of windows 7?
 
from my experience what happens is windows freezes at startup or it will boot and you would need to enter in the license key, really you will just have to purchase windows 7 again cause usually windows just freezes at start up so you will need to re install.