SIS AGP Bus Filter (sisagp) Service Defaults in Windows 7

SIS NT AGP Filter by Microsoft Corporation.

Default Settings

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

Default Behavior

SIS AGP Bus Filter is a kernel device driver. In Windows 7 it won't be started if the user doesn't start it. If SIS 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 sisagp service is not running because of the error.

Restore Default Startup Configuration of SIS 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 sisagp start= demand

3. Close the command window and restart the computer.

The sisagp service is using the sisagp.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.