How do I transfer my games from one PC to another?

So I am getting a new and better PC soon but I have games such as Crysis 2 that doesn't use Steam. I have already entered the code in once so it won't let me enter it in again. I love Crysis 2 but I do not want to have to purchase it again to play it. How do I take it from my current PC and put it on my new one. Can I put it on a flash drive, if so how?How do I transfer my games from one PC to another?
Installing a game modifies the registry, more often than not, you will need to re-install. Try using Orgin to activate it.

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