1.Download Driver Sweeper
2.Uninstall the CCC
3.boot into safe mode
4. run driver sweeper to get rid of all the leftovers
5. turn the pc off
6. take the old card out and put the new card in
7. boot into windows normally and install the drivers for the new card.
I haven't used driver sweeper in windows 7, but i am going to assume that it still works. Might be worth googling just in case though.