Sort of mate sorry for late reply I'm currently at work. Now just before we get going I am no internet security advisor. However I was in the same boat as you last year on my old system and this worked for me.
Head to Malwarebytes - https

/www.malwarebytes.com/v2/ & download the free trial version. Run the scan and if you do indeed have a virus it will flag I assure you. Afterwards report back and tell me what we're dealing with.
Also, I'm very sorry for late reply, I'm currently at work so I try to help when I can during the day.