The isapnp.sys file is the executable process for Legacy Plug and Play, or simply PnP, that is a series of Microsoft Windows features and specifications geared towards the operating system device configurations. The program sets the standard primarily aimed at existing hardware which do not support Plug and Play, such as the IBM standard bus, or the ISA. Similar specifications are also set for the external and specialist busses pre-attached via ISA development, including the LPT and RS-232 devices. As one of the Windows features, Plug and Play is the functionality of an operating system that support connectivity, management and configuration with other installed plug and play devices. PnP is part of these features that are set as the specified components. Plug and Play automatically detects devices without interfering with any ongoing tasks. PnP is a standard feature apart from the generic term plug and play itself, which is described as any specified hardware that supplies the user-required device resource.

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

A process usually a part of an installed application such as PNP ISA Bus 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 isapnp.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 isapnp.sys, belongs to, in this case PNP ISA Bus Driver