Windows 8 Services

VIA AGP Bus Filter - Windows 8 Service

VIA NT AGP Filter by Microsoft Corporation.

This service also exists in Windows 10, 7 and Vista.

Startup Type

Windows 8 edition Windows 8 Windows 8.1 Windows 8.1 Update 1
Core Manual Manual Manual
Pro Manual Manual Manual
Enterprise Manual Manual Manual

Default Properties

Display name:VIA AGP Bus Filter
Service name:viaagp
Error control:normal
Group:PnP Filter

Default Behavior

The VIA AGP Bus Filter service is a kernel mode driver. If VIA AGP Bus Filter fails to start, the error is logged. Windows 8 startup proceeds, but a message box is displayed informing you that the viaagp service has failed to start.

Restore Default Startup Type for VIA AGP Bus Filter

Automated Restore

1. Select your Windows 8 release and edition, and then click on the Download button below.

2. Save the RestoreVIAAGPBusFilterWindows8.bat file to any folder on your hard drive.

3. Right-click the downloaded batch file and select Run as administrator.

4. Restart the computer.

Note. Make sure that the viaagp.sys file exists in the %WinDir%\System32\drivers folder. If this file is missing you can try to restore it from your Windows 8 installation media.