Has it ever worked?
Code 43 errors are where the device just refuses to work and doesn't return an error code so Windows makes an assumption that it's not working and disables the card.
There are a number of reasons why this may be so, but the two most likely are that the card has died, or alternatively there's not enough power for all the cards to run. This doesn't necessarily mean your PSU isn't up to the job, but it may be you're drawing too much from one rail - rearranging your cabling may help.
One way to check if it's OS/driver or hardware is to download BAMT or SMOS, run this and see if all the cards work fine - if it does then you know all the cards are working.
Yes all 5 cards have worked before.
BAMT/SMOS is for linux...