In Feb 2010 Nvidia has provided an update for the graphics driver which when installed
into the system given the Nv4_Disp.dll Nvidia Graphics Infinite Loop Error which is the problem that many windows computers have suffering right now. This error will show in a blue screen. It shows because the graphics driver of your computer starts performing Infinite Loop on your system. When the graphics driver does not function properly then you need to prevent it correctly so that you don't get further Blue Screen Errors.
Till now Nvidia has not given any solution for this problem but the Nvidia community has created a patch to fix this problem. The problem actually caused when your computer try to use the Nv4_disp.dll file in a infinite loop. The Infinite loop is a procedure where your system performs a task over and over again. The problem can be bad coding.
To fix Nv4_Disp.dll error you can actually perform simple operations and it will be fine again. You can start with the custom patch that is made by the Nvidia community. Download and install the patch to fix the problem. If it does not work then you can update your driver. If you are also not satisfied with this then you can replace the Nv4_Disp.dll file by another Nv4_Disp.dll file which you can download online from Nvidia Website.
If all of these not work for you then your system is captured by some sort of dangerous applications like viruses, Malware or other similar threats. These can often block and corrupt device drivers and make your PC slow. These can put values into registry too that will cause serious damages as well. Don't worry because there are applications that are made to solve these kind of problems. One of its kinds is PC Health Advisor. It is a Complete PC Maintenance application that will remove all the malwares, viruses and their components. Next it fixes the errors present into your computer by scanning your computer thoroughly. Then it optimizes your PC for the best performance and gives you options to set as per your requirement. It is a perfect registry cleaner tool, so this way you are getting a multi-purpose application.