VIA AGP Bus Filter (viaagp) Service Defaults in Windows 8

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

The VIA AGP Bus Filter service is a kernel device driver. In Windows 8 it will not be started until the user starts it. If VIA AGP Bus Filter fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the viaagp service hasn't been started.

Restore Default Startup Configuration for 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 %WinDir%\System32\drivers folder. If the file is corrupted or deleted, you can put it back in there.