well what drivers are you currently using? you can goto a site such as warp2search.com and get alot of the beta drivers there. as for drivers to use it kinda depends on system and such when it comes to beta's, some betas work for some people and not others, ya gotta play around.
I would not recommend using the XP default drivers as they dont use all of the features of your card. I had the same problem as you with the nv4_disp errors, I thought it was due to nVidia not supporting the GeForce 256 DDR card as the new Detonator ones had features my card didnt.
Since then I have upgraded my card to a GeForce 2 Ti, I checked on the Windows Catalogue and hardware->Video cards and checked to see which GeForce cards were supported. Now I have had no problems at all. I am using the 184.108.40.20620, which came with the card. No problems
Abit KT7 RAID
Gainward GeForce 2 Ti/450 TV
Creative Audigy Player
MAXTOR 2 B020H1
Creative PC DVD 6x
Creative 8432e CDRW