Yes, it probably is the virus. There are a couple of viruses that know how to recognise the websites & programs to download, install the Antivirus programs. They are designed to NOT let you even download, let alone install the programs or run a scan.
"Trend Micro" is the Symantec Company that puts out one of the more famous Antiviruses. I can't remember which one.
Go to this page & download the 3 free Antivirus programs. Online reviews by PC Magazine says they are equally the 3 best (free) Antivirus programs out. ALL of them run in REAL TIME instead of only on demand when you remember to do a scan so you can have it running in the background. So you don't even need to BUY a AV after you get your current problem solved.
I downloaded all of them. (About 12 MB each.) All of them run with Win 95 or 98 & up.) I installed & tested each one SEPERATELY. (Then uninstalled each one.) The first one found a virus & deleted it.

The second one found a Trojan horse & a virus! I had a whole bunch of trouble trying to delete the virus. By the time I got the third AV installed, this one said I have no viruses now.

My puter is running MUCH faster now.

I'm keeping the third progam on, since suits my needs the best.