The gusbstoi.sys file is the process called gUSBSTOi that is used by the application AGEIA PhysX created by Ageia and later acquired by NVIDIA. This process file is a driver. It is not a visible program. It is not a core file for Windows. A driver is a computer application that controls or operates a certain device attached to the computer. It communicates with the device usually through a communications subsystem or a computer bus that is connected to the hardware. A driver is operating-system-specific and dependent on hardware. It acts as translator between the operating system or application and the hardware device. AGEIA PhysX [Physics Processing Unit] is now known as NVIDIA PhysX. This software is created to improve the performance of NVIDIA graphics card. It is a chip that is capable of calculating game physics faster than regular CPUs. It requires a graphic card with 32 CUDA cores [minimum] and 256 MB [minimum] of dedicated graphics memory. It improves graphics rendering for games that use many objects.

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

A process usually a part of an installed application such as Ageia PhysX, 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 gusbstoi.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 gusbstoi.sys, belongs to, in this case Ageia PhysX