Yes, go for the Nvidia driver update, it helped with BSODs on a brand new PC with an FX4600.
Here's a suggestion from left field... in your config.pro do you have the option "open_draw_simp_rep_by_default" yes. If you do, set it to NO.
We had huge performance issues in drawing mode related to dims and leaders with lots of lag or simply being unselectable, this is back on WF2, we've never turned it back on.
Hope this helps.
Wildfire 4.0 M160 PLM 8.0 M050
Ian Blackie
MCAD Administrator
514 341-2000 ext. 2798