Brenda needs to upgrade from Windows 8 to 8.1. Leo says she definitely needs to do that. She says that Windows wants to uninstall Sentinel runtime drivers before installing, but she can't remove them because she hasn't installed them. Leo says it could be due to a program that she used in the past, or it was preloaded in her machine. It's probably from a trial antivirus. She's going to have to reinstall the trialware, and then uninstall it using their removal tool. She can find out more at answers.microsoft.com.
ScooterX in the chatroom says that those drivers were part of licensing software embedded in other software. She should install the GUI drivers, then uninstall them.