Daca nu poti face rollback la driver si a ramas instalat partial/intr-o stare inconsistenta, fa curat cu DDU:
http://www.guru3d.com/......nload.html
Apoi descarca direct de la NVIDIA driver-ul potrivit (completezi la Manual Search fiecare camp cu valoarea corecta) si instaleaza-l:
http://www.geforce.com/drivers