What is viaagp1?

Viaagp1.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 viaagp1.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for viaagp1 drivers in need of updating

Viaagp1.sys file information

The process known as VIA NT AGP Filter belongs to software VIA CPU to AGP2.0/AGP3.0 Controller or VIA Tech CPU to AGP Controller by VIA Technologies (

Description: Viaagp1.sys is not essential for the Windows OS and causes relatively few problems. Viaagp1.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 27,904 bytes (50% of all occurrences), 32,128 bytes, 27,648 bytes or 26,880 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. There is no detailed description of this service. The file is not a Windows core file. The file is a Microsoft signed file. viaagp1.sys appears to be a compressed file. Therefore the technical security rating is 17% dangerous, however you should also read the user reviews.

Recommended: Identify viaagp1.sys related errors

Important: Some malware disguises itself as viaagp1.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the viaagp1.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

windows repair asked for this file
This file is a driver for the following ASRock motherboard K7VT2 check ASROCK for the viaagp1 diriver
  K Mallonee  
Driver File for AGP filter software
its a driver for agp slot.
When you upgrade XP SP2 it asks for this file
When I tried to reinstall Windows XP, this files was requested, "on the VIA AGP Filter Driver Disk". I have no disk of that name, and could not find the file on any of my disks. I carried on without it and now the PC won't get past login. It flashes up an error message on a blue screen, but disappears too fast to read properly, something to do with display adaptor and BIOS updates.
i found it from fujitsu/siemens home pages
  juha wahlberg  
I have a new computer and it says it is needed
  Ruth Purvis  
Necessary for motherboard.
Critical to AGP motherboard slot
I have the same problem, but I was trying to run raid 1, this looks like it is trying to access the raid CD for the file, email me for more support after I figure it out
instaler windows XP
Windows XP repair asked for this file
windows asks for the file every time windows starts to load. I just ignore it since my pc is working fine without it.
It's a AGP driver for VIA video cards. It is generally not essential to running Windows, however for anyone intending to play games failure to have this driver will result in Windows being unable to identify your video card. While the card will work fine, many games will not be able to detect that you have a video card and thus will not let you play the game because it cannot tell what video card you have. Should you find this file needed or missing (as was the case with me) please visit and download the appropriate VIA Hyperion Drivers for your operating system.
  Noam Kaze   (further information)
its safe and needed by windows for agp gfx card controllers
It is deffinently the VIA CPU to AGP2.0/3.0 Controller that needs the file
when i installed SP 2 over SP 1, indeed WINDOWS halted installation and requested VIAAGP1. i called my "pc repair guy" and asked what is it. he said he'd never heard of it and surmised that it belongs to some software previously installed. he recommended that i skip it, and i did. the pc works fine. I also just removed a fujitsu floppy drive and replaced it with another brand, which also may cause that request. I attached here a link to download VIAAGP1:
  Michael Just   (further information)
Its definitely the driver for the AGP slot, any agp gfx card wont work without it. I've just upgraded XP home to XP prof and XP prof disk was looking for it, so Microsoft like it too... :)
I too was propmted for this file and obtaned it from
  Jas Shephard   (further information)
I know it doesn't load at boot and the hp pc hangs
VIA AGP Filiter Driver Disk
Graphics driver for motherboard, windows ays its needed, and when not found my graphics suffers, seems to be a bug with windows or a virus as I can no longer install driver from my AGP driver disk as it is no recognized
the other websites have said service pac 1should have corrected the problem. i have sp2.. cant go back and reinstall sp1 solution?
When installing XP, it asked for this file. I told it to proceed without it, and it did not progress for 10 hours.
Its needed but impossible to acquire
System won't get past windows logging in page...can't find the file when trying to repair previous windows. Where's the file??
hey.. i got the driver. viaagp1.sys and it works properly.
  Niwa Daisuke  
Really essential
  Henrik Malmqvist  
i am presently dealing with upgrade to xp pro. . coupled with a "cvs.xs_ ", and a "iedw.ex_" problem. i suppose i may have to try again
it is a essential driver for identifie AGP display adapter
  R. Rockfinger  
VIA motherboard video driver
  K Kirby  
It is on your motherboard CD. If you bought a computer already built such Dell, HP your up a creek. If you had someone build you a computer they should have gave you the CD but more than likely kept because they knew you would be back with trouble and could charge you more. Don't think these people don't make copies of your CD's.
Your on-board display adapter cannot function without installing this driver. When this driver is not installed, your on board display adapter will be absent and your graphics will be poor- causing some games to be unplayable. The file is can be downloaded at Download the file, reinstall windows and when prompted for the file locate and install it.
try installing your display driver again - That is how i fixed mine
  Prathap Phillips  
viaagpsys1 on via agp filter driver
couldnt install windows without it(managed to get those files from my other computer and burn it onto a cd, then place the cd when propmted by windows) contact me if you need them on uniblue driverscanner did this for me.
This file is filter,Its for motherboard chip set i use driver detective to locate,then it must be placed in windows 32 sys files manualy some viruses disquise them self as this file name such as internet security 2010
unloaded witthout cancelling pending opereations
Windows XP repaired asked for this file and I didn't have it, so I cancelled and when PC tried to boot, every time to went to try and load video card drivers, it failed. Still can't find file
The question remains why does it disappear when doing an XP repair-install. Even now after replacing it, I cannot run Arcsoft Videoimpression v.2 (exceptions occur).The whole XP (pro) repair/install procedure is now in question for my old sempron PC at least.
  Peter Cormack  

Rating chart

Summary: Average user rating of viaagp1.sys: based on 57 votes with 41 user comments. 40 users think viaagp1.sys is essential for Windows or an installed application. 9 users think it's probably harmless. 6 users think it's neither essential nor dangerous. 2 users suspect danger. 6 users don't grade viaagp1.sys ("not sure about it").

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Best practices for resolving viaagp1 issues

A clean and tidy computer is the key requirement for avoiding problems with viaagp1. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the viaagp1.sys process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

viaagp1.sys [all]