OK, I am back.
First, the program that warned about the trojan horse is: McAfee Security Center, which I have installed.
Second. I downloaded Dr Web ® Scanner for Windows; started the scan, stopped it, went to Advanced complete scan. After scanning 141268 files, etc., the program announced that no viruses were found.
(I didn't know everything would close off except the background picture during the scan and that I would need to re-boot to get things back to normal after the scan, but I figured that out. LOL)
So, I am almost ready to contribute the 24.95 to Malware; perhaps I am not meant to have their software. Where shall we go from here? Do you want me to try to previous site again in case I can, in fact, install it this time?
I appreciate your time and trouble with this...