Using a old Hard drive with new system no os

I currently ordered everything so far except a hard drive and a operating system for my build, I have a old computer with a hard drive and i was wondering if i could use this with my new system and will it contain the operating system still? or can i wipe everything clean and use a free operating system till the new hard drive and vista 64 bit to come in a days/weeks.
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More about using hard drive system
  1. it will still have everything it used to on it.
  2. So it will still have my operating system? i can boot up with it?
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