Code 43 is a driver startup error, which typically happens when GPU has a fault.  Try swapping existing working GPU with the new card to see if the new card shows up with error 43.  There are a number of ways to try to solve this. For many people, linux will not have this problem. Sometimes booting in linux and then back to windows resolves this.  Sometimes uninstalling the driver using DDU and re-installing solves this.  But at times it can be just a faulty card that needs RMA.

I am giving this input assuming that error 43 is showing up on the new card you are adding.  If existing working cards start coming up like this, then this is most likely motherboard/bios related.