Here is my problem:
When I boot up, the computer starts to load and then freezes on the desktop. (Its worked fine for years.) If I unplug the ethernet cable and then reboot, the computer works fine. As soon as I plug the ethernet cable back into the computer, it freezes again. This means, of course, that I have no means of connecting to the Internet to run any Internet-based diagnostics.
I have run Malwarebuytes' Anti-Malware and it found adware.popcap, which I deleted. But the problem still persists--when the Ethernet is plugged in, the entire computer freezes.
Hitting ctrl-alt-delete does not work.
I appreciate any advice to solve this issue.