What is agp440?

Agp440.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if agp440.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for agp440 drivers in need of updating

Agp440.sys file information

The process known as 440 NT AGP Filter belongs to software Microsoft Windows Operating System by Microsoft (

Description: Agp440.sys is an important part of Windows, but often causes problems. Agp440.sys is located in the C:\Windows\System32\drivers folder. The file size on Windows 10/8/7/XP is 42,368 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. Agp440.sys is a Windows core system file. The program has no visible window. The service has no detailed description. It is a trustworthy file from Microsoft. agp440.sys appears to be a compressed file. Therefore the technical security rating is 4% dangerous; however you should also read the user reviews.

Recommended: Identify agp440.sys related errors

Important: Some malware disguises itself as agp440.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the agp440.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Graphics system file for XP - examine properties to make sure it is from MS
  YeeFam   (further information)
The fix is simple disable it.. follow MS instructions here.
  Wilhelm Lehmann   (further information)
If this seems to be the problem, my experience was that it is due to faulty memory every time,
  Roger Monk  
Seems like common problem with crashing at apg440.sys and not booting after that. Can be fixed only by disabling it.
when I on in Safe mode it hangs

Summary: Average user rating of agp440.sys: based on 5 votes with 5 user comments. 2 users think agp440.sys is essential for Windows or an installed application. 2 users think it's neither essential nor dangerous. One user thinks agp440.sys is dangerous and recommends removing it.

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Best practices for resolving agp440 issues

A clean and tidy computer is the key requirement for avoiding problems with agp440. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the agp440.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

agp440.sys [all]