What is sisagp?

The genuine sisagp.sys file is a software component of SiS AGP Filter for Windows NT by Silicon Integrated Systems.
Sisagp.sys is a device driver for the SiS AGP Filter for Windows NT. Device drivers allow hardware to communicate directly with the operating system and computer memory. Disabling this driver might cause problems with the hardware associated with it, such as a sound card or a graphics card. Silicon Integrated Systems (SiS) is a Taiwanese company that manufactures motherboard chipsets that have applications in consumer electronics, personal computers, HDTV, etc. It was founded in 1987 and is headquartered in Hsinchu Science Park, Taiwan.

SiSAGP stands for SiS Advanced Graphics Port Filter for Windows NT

Sisagp.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 sisagp.sys is a Windows system file or if it belongs to an application that you can trust.

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

Sisagp.sys file information

The process known as SiS NT AGP Filter belongs to software SiS® NT AGP Filter or SiS® NT AGP Filter for Windows XP by Silicon Integrated Systems (

Description: The original sisagp.sys is an important part of Windows and rarely causes problems. The sisagp.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 41,088 bytes (40% of all occurrences), 40,960 bytes or 27,136 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The sisagp.sys file is a Windows system file. The program is not visible. The service has no detailed description. Sisagp.sys is a Microsoft signed file. Therefore the technical security rating is 6% dangerous, however you should also read the user reviews.

Recommended: Identify sisagp.sys related errors

Important: Some malware disguises itself as sisagp.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the sisagp.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

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Summary: Average user rating of sisagp.sys: based on 7 votes with 1 user comment. 7 users think sisagp.sys is essential for Windows or an installed application.

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Best practices for resolving sisagp issues

A clean and tidy computer is the key requirement for avoiding problems with sisagp. 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 sisagp.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

sisagp.sys [all]