Try this.
Right click on desktop,then click on proprties,then settings,then advanced,and then Geforce 3 Additional Properties.
Click on 3D Antialiasing Settings tab at the top
Check "Manually Select the Antialiasing Mode"
Then check "No Antialiasing"
Click Apply button
Then click Direct3D Settings Tab at the top
Check "Enable Fog Emulation"
Check "Adjust Z-buffer depth to rendering depth if unequal"
Mipmap detail level-scroll down and select "best performance"
Click Apply button
Then click on OpenGL Settings tab at the top
In performance and Compatibility Options,check the first three,leave the last two unchecked
Then where you see "Default color depth for Textures"scroll down and select "Always use 32bpp"
Then where you see "Vertical Sync"scroll down and select "Always Off"
Click Apply button
Now go run 3DMark 2001 again...