There are a set of Leaked 28.90's getting around . They are from the French NVIDIA Site. You can obtain them
here
You have to manually install these drivers. There is no setup installation. I reccommend that you revert to the basic vga windows driver then after reboot manually install the 28.90. If you have Windows XP, the deed will be much easier.
Also here's a newly uploaded pair at the same site that are refresh rate compatible. Go
here and check it out.
*Remember, try these at your own risk! But if something does happen you can always go back.
* I don't even bother with leaked or unofficial drivers. The best bet IMO is to stick with WHQL certified drivers. But if your the type that likes to take risks then "Go for it!"