New built PC and old PC windows questions.

[Windows 10]

I built a new PC and moved everything except the old C:/ windows drive. The new PC is just for games. The old PC is for other utilities, paying bills, shopping, etc.1. The new PC I made I used an install usb from the old PC (Win 10) for a clean install of Win 11. Activation shows the old PC Win 10. I didn't click on that and cancelled because I still want to use that computer. I assume I need to buy a new activation key to remove the watermark on the screen on the new PC.2. I removed all the other drives from the old PC which only had game libraries on them. Now the old PC will not boot anymor

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