The file filter.sys, known as WDM NULL filter driver, belongs to software Windows (version 2000 DDK driver) by Walter Oney Software. WDM (Windows Driver Model) Filter drivers are optional drivers that add value to peripheral devices or support a specialized device, can modify the behavior of a device, and may be non-device driver. The driver module filter.sys is a module that is inserted into the existing driver stack to perform some specific function. It will not affect the normal working of the existing driver stack in any major way. The WDM NULL filter driver provides an added functionality or behavior to the device that it supports, and removing the file filter.sys will result to the loss of this special function. However, the device that it supports will continue to perform its original functionality. Any number of filter drivers can be added to Windows, which may be provided by the vendor of the hardware or computer peripheral.

Most non-system processes that are running can be stopped because they are not involved in running your operating system. filter.sys. is used by WDM NULL filter driver, If you shut down filter.sys, it will likely start again at a later time either after you restart your computer or after an application start. To stop filter.sys, permanently you need to uninstall the application that runs this process which in this case is WDM NULL filter driver, from your system.

After uninstalling applications it is a good idea to scan you Windows registry for any left over traces of applications. Registry Reviver by ReviverSoft is a great tool for doing this.

The ReviverSoft experts have not yet reviewed filter.sys

A process usually a part of an installed application such as WDM NULL filter driver, or your operating system that is responsible for running in functions of that application. Some application require that they have processes running all the time so they can do things such as check for updates or notify you when you get an instant message. Some poorly written applications have many processes that run that may not be required and take up valuable processing power within your computer.

We have not received any complaint about this process having higher than normal impact on PC performance. If you have had bad experiences with it please let us know in a comment below and we will investigate it further.

The first thing you should do if filter.sys. is causing errors on your computer is to run a Windows registry scan with Registry Reviver If you are still seeing errors after this you should uninstall the program that filter.sys, belongs to, in this case WDM NULL filter driver