The mail came from China, and the Subject was simply "JOB." I opened the message, which asked if I was interested in a position in the steel industry (which I am not), and I just closed the email and that was that. At least until I opened my Firefox browser a minute or two later, and before even navigating anywhere I got one of those red-screen notices that I had to call a US toll-free number right away to get rid of a threat. And if that wasn't enough, my keyboard and mouse started behaving erratically. I did manage to open Task Manager, and didn't see any suspicious process running, but by that time the system was totally locked, so I powered it down.
Next time it booted, everything looked normal, and a Windows Security 'quick' scan showed nothing. The browser seems to be working okay, but who knows what might still be lurking. I'm inclined to just go about my business, but have some reservations about just blowing the whole thing off. I figured that someone who knew what they were doing might have suggestions.
Any advice will be most welcome.