All I can suggest is that you go to guru of 3D
Link:
http://www.guru3d.com/
Then click on the downloads tab goto>>>Generic Utilities, and download Drive cleaner pro
Once you have it installed, b sure to have your nvidia driver handy be it downloaded or on cd rom.
Goto Control panel and delete your nvidia drivers, you will then have to reboot, after the reboot RUN drive cleaner pro this will get rid of any residual nvidia registry info once it has cleaned, you can then go ahead and re-install your nvidia drivers.
Also be sure to TURN OFF you anti virus whilst installing nvidia.
You will then have a nice clean install of your driver and hopefully the Nv4_disp.dll Infinite Loop, wil have been cured
