The hphid409.sys file is the process called IEEE-1284.4-1999 Driver for Windows 2000 that is used by application HP Dot4 Windows 2000 created by Hewlett Packard. This process file is a driver. It does not use a visible window. It is not a core file for Windows. It is a legitimate process. DOT4 pertains to a protocol that enables a device belonging to an MFP [multifunction peripheral] to simultaneously receive and send multiple data packets across single physical channel going to other devices on MFP. Data exchanges are independent that means one is not affected by the other. The HP OfficeJEt series is an example of MFP. These devices are all-in-one printer, scanner and fax machine. The IEEE 1284.4 driver specifies the DOT4 protocol. IEEE 1284.4 is the enhanced version of IEEE 1284 that is a protocol created for parallel ports on PC [personal computers].

Most non-system processes that are running can be stopped because they are not involved in running your operating system. hphid409.sys. is used by HP Dot4 Windows, If you shut down hphid409.sys, it will likely start again at a later time either after you restart your computer or after an application start. To stop hphid409.sys, permanently you need to uninstall the application that runs this process which in this case is HP Dot4 Windows, 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 hphid409.sys

A process usually a part of an installed application such as HP Dot4 Windows, 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 hphid409.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 hphid409.sys, belongs to, in this case HP Dot4 Windows