A technician is working on a desktop computer that is not performing as expected. Program windows sometimes open and close without user intervention. Windows cannot check for OS updates, and some…

Standard troubleshooting methodology requires identifying and reversing the most recent change first; a recently installed driver that is incompatible or buggy can cause programs to behave erratically, disrupt Windows Update connectivity, and block certain websites - rolling back the driver directly addresses the most probable root cause before escalating to other steps.

A defective keyboard could cause unintended keystrokes but would not explain the inability to reach Windows Update servers or block specific websites.

Resetting Internet Options addresses browser-level proxy and security settings but would not cause applications to open and close autonomously without user input.

Unplugging the Ethernet cable would remove all network connectivity and does not resolve the underlying cause of the described symptoms.