two keys used at a single computer issue

i've had an issue on my PC which caused it to go unstable after overloading my resources on rendering and compositing at the same time, it crashed my PC and had to reboot it which i had to fiddle around the hardware trying to fix it afterwards, when i got it booted again, my davinci resolve asked for an activation key again which i did provide and worked however showed that i used up all my keys now inside a single machine. how do i fix this issue, how do i deactivate the other key thats being used on my pc?

You shouldn't need to worry about it. If you ever try a third activation, the first two will automatically be deactivated.