As initial troubleshooting, it is recommended to do the following:

1. Uninstall DSA and reboot.
2. Install the latest DSA 10.0.

If the issue is not resolved, proceed with manually installing the filter driver:

1. Select one of adapters, and enter properties to install the driver.

   

2. Install the driver under "C:\Program Files\Trend Micro\Deep Security Agent\infsys\WinxpRelease". Select "Yes" for any pop-up dialog.
3. Verify that the driver is loaded.

   

To manually switch the Driver Signing Option, navigate to System Properties > Hardware > Driver Signing. Then switch to "Ignore" at least before driver is installed.

Once the driver is installed, you may switch it back when necessary.