I 'may' be barking up the wrong trouser leg but have you tried downloading, updating then running Malwarebytes? It won't take longer than about 30 minutes in total and it's worth running it on your PC anyway.
Just a thought.
Make sure you 'update' it before running it. It'll ask you if you want to update it once it's installed. You may see it for sale on the net.... DON'T pay for it, it's free!