Hello cyberpenpal -
You did not reply to if you have now installed a better Antivirus program, so I thought I might add a small note to help you.
It is really dangerous to go online without a decent antivirus, and a Firewall.
Without one, you are extremely likely to get infected. I can't tell you which one is the best because determining that is generally not feasible.
However, I can give you recommendations for programs that I have tested and that I trust.
All of the following are excellent, provided free (not free trials of) antiviruses - Be sure to only ever install one
on your computer at any time.
This can be added to with Malwarebytes Anti-Malware Free
and SuperantiSpyware Free or
in paid / active versions -
I hope this information helps you.
Thank You -