thist drivers is for vista, but works for Win7, you mast unzip (or unrar, better) iin a new folder, a search with the hardware administrator...
NVIDIA nForce AR Chipset Driver PC portátil HP Pavilion dv6921la - Asistencia Técnica HP (Chile - Español)
and
Controlador de lector de tarjeta 5 en 1 Ricoh PC portátil HP Pavilion dv6921la - Asistencia Técnica HP (Chile - Español)