Using a driver file that is not supported or distributed by the manufacturer
is not recommended for most users. For those that are knowledgable enough to
understand what they are working with it may be fine, but for the majority
that is not a good idea. Plus, as I stated, there is probably a reason that
a decision was made not to support that card series that may very well be
due to a physical limitation that will eventually cause issues. If Nvidia
truly wanted to just sell more cards then they would have developed a whole
new product line and not supported existing ones under Vista.
I used an older 3dfx voodoo card for several years under XP even though
support from their buyer, Nvidia, was dropped before XP ever got out of
beta. I used third party modified drivers (and even modified some myself)
for a long time, but it didn't get better. It got worse and eventually I
gave in to the inevitable and purchased an ATI that was supported. Haven't
had any problems with that system since.
For now, the WDDM drivers in Vista or from a third party may suffice, but
you may find eventually (and sooner than you think) that they will not.
Should OP decide to purchase a new Nvidia card, it would be in their best
interest to ensure they purchase a supported card.
--
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Windows help -
www.rickrogers.org