Hi larryrutt
Did you get that error message while browsing the web?
Yes, but I don't recall what the item was.
Hello and Welcome to Malwarebytes...
As you stated since you don't have more details its really hard for us to determine if something actually got through especially a ransomeware as you stated. By the sounds of it, it sounds as if it was one of those fake scam popups, like the ones below, does that look familiar?
Similar to these ?
MalwareScam.wmv
MalwareScam-1.wmv
MalwareScam-2.wmv
MalwareScam-3.wmv
MalwareScam-4.wmv
MalwareScam-5.wmv
MalwareScam-6.wmv
NOTE: Thanks to @David H. Lipman for the videos.