Question about old HDD and new build

Hey everyone.
I'm building a PC for my dad this christmas.
We're almost starting from scratch, except the cd drive, we'll reuse that.
Anyway, I want to know if I can use the old HDD and keep win7 on it.
I will obviously be replacing the mobo and cpu, and I heard that doing so will make your hdd incompatible or something, having to wipe it then install a new windows 7 os.
My dad's current pc has OEM windows 7 I believe.
I want to know because saving $100 on this would be great, and looking for anyway to not pay for an OS he already has.
I do not know much about hard drives, admittedly.
I.e reformatting and wiping a HDD.
I know this is probably a common question, but searching around it's hard to find a clear answer.
I do not know if my father kept a recovery disc, his current PC is also just an HP.
If it's possible that i can just wipe the hard drive, install in the new pc and run the recovery disc in the drive that would be great.
I'm sorry that I may sound ignorant in this post, I'm just really uncertain about what to do.
Thank you for anyone taking the time to help. You guys are great.
3 answers Last reply Best Answer
More about question hdd build
  1. Best answer
    Regarding Windows OEM:
    - OEM licenses are tied to the very first computer you install and activate it on
    - OEM versions allow all hardware upgrades except for an upgrade to a different model motherboard.
  2. Aw man.
    Thanks for the help. I needed a straight answer and you gave it to me.
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