This process removes the old drivers you were using and allows you to put newer ones on your PC without any of the old files causing any havoc,
You should do this because the card you are using is 2 (1) generation newer.
The drivers currently in your machine are not optimized for this card.
If you have removed the old drivers then installed the new ones that came wit your
new card, it is likely some files were left behind and the steps above will help you resolve the issue.