I had bad problems last year - it cost me a fortune to get the PC cleaned, and then I had to lay out a tidy sum to have a decent anti-virus installed.
My laptop is badly effected, so I avoid using it on line
The best freebie, in my opinion, is the Avast, but like all freebies - you get what you don't pay for (if that makes sense).
Avast has a 'safe zone) function which allows you to work around the bugs, but it doesn't get rid of them.
I bought ESET Security, after some research and advice - seems good, but only lasts for 2 years.
Good luck
"offers from dubious women"
Never live up to expectations, according to my wife!!
Jim Carroll