The driver was one installed on the computer by the security company. The driver would look for and block threats incoming via the internet or intranet.

The definitions update included a driver update, and most of the computers the software was used on were configured to automatically restarted to install the update. Unfortunately, the faulty driver update caused computers to BSOD and enter a boot loop.

The driver could be removed manually by entering Safe Mode. That’s the thing you saw about deleting that file.