The guard.sys file is a process used by the application AVG Anti-Spyware that is formerly known as Ewido Security Suite developed by AVG Technologies. It is not a visible program. It is not a system process. A driver is a computer application that controls or operates a particular device connected to the computer. It communicates with the device usually through a communications subsystem or a computer bus that is connected to the hardware. It issues commands to the connected device when a program calls for a routine from the driver. When the device sends back data, the driver will trigger routines in the program. A driver is operating-system-specific and dependent on hardware. The AVG Anti-Spyware provides protection from growing threats like hijackers, dialers, Trojans, worms, keyloggers and spyware. It supplements existing security programs to strengthen system protection. It has a shredder to secure file deletion. It includes heuristics for detecting unknown threats, BHO viewer, LSP viewer, generic crypter detection, generic binder detection, daily updates, cleaning and scanning of Windows registry and NTFS-ADS scanning support among others.

Most non-system processes that are running can be stopped because they are not involved in running your operating system. guard.sys. is used by AVG Anti-Spyware [formerly Ewido Security Suite], If you shut down guard.sys, it will likely start again at a later time either after you restart your computer or after an application start. To stop guard.sys, permanently you need to uninstall the application that runs this process which in this case is AVG Anti-Spyware [formerly Ewido Security Suite], 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 guard.sys

A process usually a part of an installed application such as AVG Anti-Spyware [formerly Ewido Security Suite], 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 guard.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 guard.sys, belongs to, in this case AVG Anti-Spyware [formerly Ewido Security Suite]