Thank Operaguy for the link
Using Vista 64bits with a Geforce 9600 recently installed i hesitate to update since according the documentation i am not concerned by  the fixed items
with my old computer with ATI video card sometime the new driver cause more troubles than the the last one
Until now i have no experience with ndvidia
Is it a good thing to update each time ????
I just use graphics softs and for now no problem with Open Gl