VIA AGP Bus Filter (viaagp) Service Defaults in Windows 7

VIA NT AGP Filter by Microsoft Corporation.

Default Settings

Startup type: Manual
Display name:VIA AGP Bus Filter
Service name:viaagp
Service type:kernel
Error control:normal
Group:PnP Filter
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\viaagp

Default Behavior

VIA AGP Bus Filter is a kernel device driver. In Windows 7 it won't be started if the user doesn't start it. If VIA AGP Bus Filter fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the viaagp service is not running because of the error.

Restore Default Startup Configuration of VIA AGP Bus Filter

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config viaagp start= demand

3. Close the command window and restart the computer.

The viaagp service is using the viaagp.sys file that is located in the C:\Windows\system32\DRIVERS directory. If the file is removed or corrupted, read this article to restore its original version from Windows 7 installation media.