This kind of alerts have nothing to do with viruses.
NetWorx uses a driver called NetFilter for filtering out local traffic. Unfortunately, this driver was
also misused by others in some malware, that's why virus scanners are showing the warnings. If you are still concerned about these warnings, you can use the portable edition of NetWorx which doesn't include the driver, or simply choose not to install the driver when you are installing NetWorx.
For more information, here is an
article about false positive malware detections.